feat(sdk): add Effect HttpApi codegen

This commit is contained in:
Kit Langton
2026-06-22 16:48:04 -04:00
parent a0a500316e
commit b241e38cc8
16 changed files with 1753 additions and 0 deletions
+14
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@@ -476,6 +476,18 @@
"effect": "4.0.0-beta.83",
},
},
"packages/httpapi-codegen": {
"name": "@opencode-ai/httpapi-codegen",
"dependencies": {
"effect": "catalog:",
"prettier": "3.6.2",
},
"devDependencies": {
"@tsconfig/bun": "catalog:",
"@types/bun": "catalog:",
"@typescript/native-preview": "catalog:",
},
},
"packages/llm": {
"name": "@opencode-ai/llm",
"version": "1.17.9",
@@ -1800,6 +1812,8 @@
"@opencode-ai/http-recorder": ["@opencode-ai/http-recorder@workspace:packages/http-recorder"],
"@opencode-ai/httpapi-codegen": ["@opencode-ai/httpapi-codegen@workspace:packages/httpapi-codegen"],
"@opencode-ai/llm": ["@opencode-ai/llm@workspace:packages/llm"],
"@opencode-ai/plugin": ["@opencode-ai/plugin@workspace:packages/plugin"],
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@@ -0,0 +1,40 @@
# @opencode-ai/httpapi-codegen
Build-time source generation for domain-oriented Effect APIs derived from `HttpApi` and Effect Schema contracts.
The package is private while its API is explored. Its tests are the executable specification for the generator. It must remain independent of OpenCode Core and use synthetic `HttpApi` fixtures.
## Settled rules
- Flatten path, query, header, and payload fields into one input object.
- Reject duplicate field names across input channels.
- Emit no method argument for zero fields, an optional object when every field is optional, and a required object when any field is required.
- Unwrap exact `{ data: A }` success envelopes.
- Map no-content success to `void`.
- Preserve other single success values.
- Reject ambiguous multiple-success contracts.
- Expose streaming success as `Stream`, not `Effect<Stream>`.
- Reject schemas whose wire/domain transformation cannot be generated exactly.
- Map transport, unexpected-status, and response-decoding failures to one stable generated `ClientError`.
- Generate only the Effect API initially; Promise runtime ownership, cancellation, and stream adaptation are deferred.
- Commit generated source for review; CI regenerates and fails when the worktree changes.
- Track generated files in `.httpapi-codegen.json` so regeneration removes only stale files previously owned by the generator.
## Boundary
This package generates only the remote API derived from `HttpApi`. It does not generate embedded implementations or embedded-only capabilities. The OpenCode integration composes two distinct total objects:
- A remote object containing the generated HTTP capabilities.
- An embedded object implementing the shared shape against local services and adding embedded-only capabilities.
The embedded object may be a structural superset of the remote object, but the constructors and concrete result types remain distinct.
Codegen generates every endpoint in the `HttpApi` it receives. OpenCode owns the product decision by composing the exact remote API before invoking the generator; the generic package has no endpoint filtering policy.
The public `generate(Api, { directory })` operation is an Effect requiring `FileSystem`. Internally it composes a pure `compile(Api)` phase with `write(output, directory)`. Compiler tests inspect virtual files directly; writer tests use `FileSystem.makeNoop`.
Generation formats TypeScript with Prettier before writing. Output paths are flat, unique, and checked against traversal, reserved manifest names, and existing symbolic links.
Generated source starts with one self-contained module per `HttpApiGroup`, plus root client and index modules. Schema dependencies may be duplicated across group modules. Cross-group schema partitioning is deferred until measured output or bundle cost requires it.
Codegen preserves group and endpoint identifiers exactly. The composed remote `HttpApi` owns public names such as `session` and `get`; the generator performs no prefix stripping, casing conversion, or public-name annotation mapping.
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{
"$schema": "https://json.schemastore.org/package.json",
"name": "@opencode-ai/httpapi-codegen",
"private": true,
"type": "module",
"scripts": {
"test": "bun test --timeout 5000 --only-failures",
"typecheck": "tsgo --noEmit"
},
"dependencies": {
"effect": "catalog:",
"prettier": "3.6.2"
},
"devDependencies": {
"@tsconfig/bun": "catalog:",
"@types/bun": "catalog:",
"@typescript/native-preview": "catalog:"
}
}
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@@ -0,0 +1,757 @@
import { isAbsolute, join } from "node:path"
import { Effect, FileSystem, PlatformError, Schema, SchemaAST, SchemaRepresentation } from "effect"
import type { HttpRouter } from "effect/unstable/http"
import { HttpApi, HttpApiEndpoint, HttpApiGroup, HttpApiSchema } from "effect/unstable/httpapi"
import { format } from "prettier"
export type InputField = {
readonly name: string
readonly source: "params" | "query" | "headers" | "payload"
}
export type Operation = {
readonly group: string
readonly name: string
readonly input: ReadonlyArray<InputField>
readonly inputMode: "none" | "optional" | "required"
readonly success: "value" | "void" | "stream"
readonly errors: ReadonlyArray<string>
}
export type Output = {
readonly operations: ReadonlyArray<Operation>
readonly files: ReadonlyArray<{
readonly path: string
readonly content: string
}>
}
export class GenerationError extends Schema.TaggedErrorClass<GenerationError>()("GenerationError", {
reason: Schema.String,
}) {
override get message() {
return this.reason
}
}
type Endpoint = {
readonly group: string
readonly topLevel: boolean
readonly endpoint: HttpApiEndpoint.AnyWithProps
readonly params: Schema.Top | undefined
readonly query: Schema.Top | undefined
readonly headers: Schema.Top | undefined
readonly payloads: ReadonlyArray<Schema.Top>
readonly operation: Operation
readonly input: ReadonlyArray<InputField & { readonly optional: boolean }>
readonly unwrapData: boolean
readonly errors: ReadonlyArray<Schema.Top>
readonly successes: ReadonlyArray<Schema.Top>
}
type Group = {
readonly identifier: string
readonly module: string
readonly endpoints: ReadonlyArray<Endpoint>
}
type Slot = {
readonly name: string
readonly schema: Schema.Top
}
const resolveHttpApiStatus = SchemaAST.resolveAt<number>("httpApiStatus")
const resolveHttpApiEncoding = SchemaAST.resolveAt<unknown>("~httpApiEncoding")
const Manifest = Schema.fromJsonString(Schema.Array(Schema.String))
const manifestName = ".httpapi-codegen.json"
export function compile<Id extends string, Groups extends HttpApiGroup.Any>(api: HttpApi.HttpApi<Id, Groups>): Output {
const endpoints: Array<Endpoint> = []
const portable = new Map<SchemaAST.AST, boolean>()
HttpApi.reflect(api, {
onGroup() {},
onEndpoint({ endpoint, errors, group, middleware }) {
const name = `${group.identifier}.${endpoint.name}`
const required = Array.from(middleware).find((item) => item.requiredForClient)
if (required !== undefined) {
throw new GenerationError({ reason: `Client middleware requires adapter: ${required.key}` })
}
const successSchemas = Array.from(endpoint.success)
if (successSchemas.length === 0) successSchemas.push(HttpApiSchema.NoContent)
if (successSchemas.length > 1) throw new GenerationError({ reason: `Multiple success schemas: ${name}` })
const params = normalizeTransport(endpoint.params, "params", endpoint, name)
const query = normalizeTransport(endpoint.query, "query", endpoint, name)
const headers = normalizeTransport(endpoint.headers, "headers", endpoint, name)
const sourcePayloads = Array.from(endpoint.payload.values()).flatMap(({ schemas }) => schemas)
if (sourcePayloads.length > 1) {
throw new GenerationError({ reason: `Multiple payload schemas: ${name}` })
}
const payloads = sourcePayloads.map((schema) => normalizeTransport(schema, "payload", endpoint, name)!)
const success = normalizeTransport(successSchemas[0], "success", endpoint, name)!
const errorSchemas = Array.from(errors.values()).flatMap((schemas) =>
schemas.map((schema) => normalizeTransport(schema, "error", endpoint, name)!),
)
const inputs = [
...inputFields(params, "params", name),
...inputFields(query, "query", name),
...inputFields(headers, "headers", name),
...payloads.flatMap((schema) => inputFields(schema, "payload", name)),
]
const names = new Set<string>()
for (const field of inputs) {
if (names.has(field.name)) throw new GenerationError({ reason: `Input field collision: ${field.name}` })
names.add(field.name)
}
const schemaPaths: Array<readonly [string, Schema.Top]> = [
...(params === undefined ? [] : [[`${name}.params`, params] as const]),
...(query === undefined ? [] : [[`${name}.query`, query] as const]),
...(headers === undefined ? [] : [[`${name}.headers`, headers] as const]),
...payloads.map((schema) => [`${name}.payload`, schema] as const),
...responseSchemas(success, `${name}.success`),
...errorSchemas.map((schema) => [`${name}.error`, schema] as const),
]
for (const [path, schema] of schemaPaths) assertPortable(schema, path, portable)
endpoints.push({
group: group.identifier,
topLevel: group.topLevel,
endpoint,
params,
query,
headers,
payloads,
input: inputs,
unwrapData: isDataEnvelope(success),
successes: [success],
errors: errorSchemas,
operation: {
group: group.identifier,
name: endpoint.name,
input: inputs.map(({ name, source }) => ({ name, source })),
inputMode: inputs.length === 0 ? "none" : inputs.every((field) => field.optional) ? "optional" : "required",
success: isStreamSchema(success) ? "stream" : HttpApiSchema.isNoContent(success.ast) ? "void" : "value",
errors: [
...new Set([
...errorSchemas.flatMap((schema) => {
const identifier = SchemaAST.resolveIdentifier(schema.ast)
return identifier === undefined ? [] : [identifier]
}),
"ClientError",
]),
],
},
})
},
})
const modules = new Set(["client", "client-error", "index"])
const groups = Array.from(
Map.groupBy(endpoints, (endpoint) => endpoint.group),
([identifier, endpoints], index) => {
const base = /^[A-Za-z0-9_-]+$/.test(identifier) ? identifier : `group-${index}`
const module = uniqueModule(base, index, modules)
modules.add(module.toLowerCase())
return { identifier, module, endpoints }
},
)
const publicNames = new Set<string>()
for (const group of groups) {
const names = group.endpoints[0]?.topLevel ? group.endpoints.map((item) => item.endpoint.name) : [group.identifier]
for (const name of names) {
if (publicNames.has(name)) throw new GenerationError({ reason: `Client name collision: ${name}` })
publicNames.add(name)
}
}
return {
operations: endpoints.map((endpoint) => endpoint.operation),
files: [
...groups.map((group, index) => ({
path: `${group.module}.ts`,
content: renderGroup(group, index),
})),
{
path: "client-error.ts",
content:
'import { Schema } from "effect"\n\nexport class ClientError extends Schema.TaggedErrorClass<ClientError>()("ClientError", {\n cause: Schema.Defect(),\n}) {}\n',
},
{ path: "client.ts", content: renderClient(groups) },
{ path: "index.ts", content: 'export { ClientError } from "./client-error"\nexport { make } from "./client"\n' },
],
}
}
function uniqueModule(base: string, index: number, modules: ReadonlySet<string>) {
if (!modules.has(base.toLowerCase())) return base
const seed = `${base}-${index}`
let suffix = 0
while (modules.has(`${seed}${suffix === 0 ? "" : `-${suffix}`}`.toLowerCase())) suffix++
return `${seed}${suffix === 0 ? "" : `-${suffix}`}`
}
function normalizeTransport(
schema: Schema.Top | undefined,
source: InputField["source"] | "success" | "error",
endpoint: HttpApiEndpoint.AnyWithProps,
operation: string,
) {
if (schema === undefined || isStreamSchema(schema)) return schema
if (!metadataPortable(schema.ast, new Set())) {
throw new GenerationError({ reason: `Unportable schema: ${operation}.${source}` })
}
const decoded = Schema.toType(schema)
if (!isPathInput(endpoint.path)) {
throw new GenerationError({ reason: `Invalid endpoint path: ${operation}` })
}
const rebuilt = HttpApiEndpoint.make(endpoint.method)(endpoint.name, endpoint.path, {
...(source === "params" ? { params: decoded } : undefined),
...(source === "query" ? { query: decoded } : undefined),
...(source === "headers" ? { headers: decoded } : undefined),
...(source === "payload" ? { payload: decoded } : undefined),
...(source === "success" ? { success: decoded } : { success: Schema.String }),
...(source === "error" ? { error: decoded } : undefined),
})
const normalized =
source === "params"
? rebuilt.params
: source === "query"
? rebuilt.query
: source === "headers"
? rebuilt.headers
: source === "payload"
? Array.from(rebuilt.payload.values())[0]?.schemas[0]
: source === "success"
? Array.from(rebuilt.success)[0]
: Array.from(rebuilt.error)[0]
if (normalized === undefined || !sameEncoding(schema.ast, normalized.ast)) {
throw new GenerationError({ reason: `Unportable schema: ${operation}.${source}` })
}
return decoded
}
function isPathInput(path: string): path is HttpRouter.PathInput {
return path === "*" || path.startsWith("/")
}
function sameEncoding(left: SchemaAST.AST, right: SchemaAST.AST): boolean {
if (left._tag !== right._tag || left.encoding?.length !== right.encoding?.length) return false
if (
left.encoding?.some((link, index) => {
const other = right.encoding?.[index]
return other === undefined || link.transformation !== other.transformation || !sameEncoding(link.to, other.to)
})
)
return false
if (!sameChecks(left.checks, right.checks) || !sameContext(left.context, right.context)) return false
if (SchemaAST.isSuspend(left) && SchemaAST.isSuspend(right)) return sameEncoding(left.thunk(), right.thunk())
if (SchemaAST.isUnion(left) && SchemaAST.isUnion(right)) {
return (
left.types.length === right.types.length &&
left.types.every((ast, index) => sameEncoding(ast, right.types[index]))
)
}
if (SchemaAST.isArrays(left) && SchemaAST.isArrays(right)) {
return (
left.elements.length === right.elements.length &&
left.rest.length === right.rest.length &&
left.elements.every((ast, index) => sameEncoding(ast, right.elements[index])) &&
left.rest.every((ast, index) => sameEncoding(ast, right.rest[index]))
)
}
if (SchemaAST.isObjects(left) && SchemaAST.isObjects(right)) {
return (
left.propertySignatures.length === right.propertySignatures.length &&
left.indexSignatures.length === right.indexSignatures.length &&
left.propertySignatures.every((field, index) => sameEncoding(field.type, right.propertySignatures[index].type)) &&
left.indexSignatures.every(
(field, index) =>
sameEncoding(field.parameter, right.indexSignatures[index].parameter) &&
sameEncoding(field.type, right.indexSignatures[index].type),
)
)
}
return true
}
function sameChecks(left: SchemaAST.Checks | undefined, right: SchemaAST.Checks | undefined): boolean {
if (left?.length !== right?.length) return false
if (left === undefined || right === undefined) return true
return left.every((check, index) => {
const other = right[index]
if (other === undefined || check._tag !== other._tag) return false
if (check._tag === "Filter" && other._tag === "Filter") {
return check.run === other.run && check.aborted === other.aborted
}
return check._tag === "FilterGroup" && other._tag === "FilterGroup" && sameChecks(check.checks, other.checks)
})
}
function sameContext(left: SchemaAST.Context | undefined, right: SchemaAST.Context | undefined) {
return left?.isOptional === right?.isOptional && left?.isMutable === right?.isMutable
}
export function write(
output: Output,
directory: string,
): Effect.Effect<void, GenerationError | PlatformError.PlatformError, FileSystem.FileSystem> {
return Effect.gen(function* () {
const paths = new Set<string>()
for (const file of output.files) {
if (!isSafeOutputPath(file.path)) yield* new GenerationError({ reason: `Unsafe output path: ${file.path}` })
const path = file.path.toLowerCase()
if (paths.has(path)) yield* new GenerationError({ reason: `Duplicate output path: ${file.path}` })
paths.add(path)
}
const fs = yield* FileSystem.FileSystem
yield* fs.makeDirectory(directory, { recursive: true })
const manifest = join(directory, manifestName)
const previous = (yield* fs.exists(manifest))
? yield* fs.readFileString(manifest).pipe(
Effect.flatMap(Schema.decodeUnknownEffect(Manifest)),
Effect.mapError(() => new GenerationError({ reason: `Invalid generated file manifest: ${manifest}` })),
)
: []
if (previous.some((path) => !isSafeOutputPath(path))) {
yield* new GenerationError({ reason: `Invalid generated file manifest: ${manifest}` })
}
yield* Effect.forEach(
previous.filter((path) => !output.files.some((file) => file.path === path)),
(path) => fs.remove(join(directory, path), { force: true }),
{ concurrency: 8, discard: true },
)
yield* Effect.forEach(
output.files,
(file) =>
fs.exists(join(directory, file.path)).pipe(
Effect.flatMap((exists) => (exists ? fs.stat(join(directory, file.path)) : Effect.succeed(undefined))),
Effect.flatMap((info) =>
info?.type === "SymbolicLink"
? new GenerationError({ reason: `Unsafe output path: ${file.path}` })
: Effect.void,
),
),
{ concurrency: 8, discard: true },
)
yield* Effect.forEach(
output.files,
(file) =>
Effect.tryPromise({
try: () => format(file.content, { parser: "typescript", semi: false, printWidth: 120 }),
catch: (error) => new GenerationError({ reason: `Failed to format ${file.path}: ${String(error)}` }),
}).pipe(Effect.flatMap((content) => fs.writeFileString(join(directory, file.path), content))),
{ concurrency: 8, discard: true },
)
yield* fs.writeFileString(manifest, JSON.stringify(output.files.map((file) => file.path).sort(), null, 2) + "\n")
})
}
function isSafeOutputPath(path: string) {
return path !== manifestName && !isAbsolute(path) && path !== "." && path !== ".." && !/[\\/]/.test(path)
}
export function generate<Id extends string, Groups extends HttpApiGroup.Any>(
api: HttpApi.HttpApi<Id, Groups>,
options: { readonly directory: string },
): Effect.Effect<void, GenerationError | PlatformError.PlatformError, FileSystem.FileSystem> {
return Effect.try({
try: () => compile(api),
catch: (error) => (error instanceof GenerationError ? error : new GenerationError({ reason: String(error) })),
}).pipe(Effect.flatMap((output) => write(output, options.directory)))
}
function inputFields(schema: Schema.Top | undefined, source: InputField["source"], operation: string) {
if (schema === undefined) return []
const ast = Schema.toType(schema).ast
if (!SchemaAST.isObjects(ast) || ast.indexSignatures.length > 0) {
throw new GenerationError({ reason: `Input schema must be a struct: ${operation}.${source}` })
}
return ast.propertySignatures.map((field) => {
if (typeof field.name !== "string") {
throw new GenerationError({ reason: `Input field must have a string name: ${operation}.${source}` })
}
return {
name: field.name,
source,
optional: SchemaAST.isOptional(field.type),
}
})
}
function responseSchemas(schema: Schema.Top, path: string): Array<readonly [string, Schema.Top]> {
if (HttpApiSchema.isNoContent(schema.ast)) return []
if (!isStreamSchema(schema)) return [[path, schema]]
if (schema._tag === "StreamUint8Array") return []
const value = schema.sseMode === "data" ? streamDataSchema(schema) : schema.events
const rebuilt =
schema.sseMode === "data"
? HttpApiSchema.StreamSse({ data: value, error: schema.error, contentType: schema.contentType })
: HttpApiSchema.StreamSse({
events: schema.events,
error: schema.error,
contentType: schema.contentType,
})
if (!sameEncoding(schema.events.ast, rebuilt.events.ast)) {
throw new GenerationError({ reason: `Unportable schema: ${path}.${schema.sseMode}` })
}
return [
[`${path}.${schema.sseMode}`, value],
[`${path}.error`, schema.error],
]
}
function assertPortable(schema: Schema.Top, path: string, portable: Map<SchemaAST.AST, boolean>) {
const visiting = new Set<SchemaAST.AST>()
const taggedError = taggedErrorFields(schema)
const visit = (ast: SchemaAST.AST): boolean => {
const cached = portable.get(ast)
if (cached !== undefined) return cached
if (visiting.has(ast)) return true
visiting.add(ast)
const result = visitCurrent(ast)
visiting.delete(ast)
portable.set(ast, result)
return result
}
const visitCurrent = (ast: SchemaAST.AST): boolean => {
if (!annotationsPortable(ast.annotations)) return false
if (!checksPortable(ast.checks) || ("encodingChecks" in ast && !checksPortable(ast.encodingChecks))) return false
if (SchemaAST.isDeclaration(ast)) {
return generationPortable(ast.annotations?.generation) && ast.typeParameters.every(visit)
}
if (ast.encoding !== undefined && ast.annotations?.generation === undefined) return false
if (SchemaAST.isSuspend(ast)) return visit(ast.thunk())
if (SchemaAST.isUnion(ast)) return ast.types.every(visit)
if (SchemaAST.isArrays(ast)) {
return ast.elements.every(visit) && ast.rest.every(visit)
}
if (SchemaAST.isObjects(ast)) {
return (
ast.propertySignatures.every((field) => visit(field.type)) &&
ast.indexSignatures.every((index) => visit(index.parameter) && visit(index.type))
)
}
if (SchemaAST.isTemplateLiteral(ast)) return ast.parts.every(visit)
return true
}
if (taggedError !== undefined && SchemaAST.isDeclaration(schema.ast)) {
if (
schema.ast.checks !== undefined ||
("encodingChecks" in schema.ast && !checksPortable(schema.ast.encodingChecks)) ||
schema.ast.typeParameters.some((ast) => ast.checks !== undefined) ||
!schema.ast.typeParameters.every(visit)
) {
throw new GenerationError({ reason: `Unportable schema: ${path}` })
}
return
}
if (!visit(schema.ast)) throw new GenerationError({ reason: `Unportable schema: ${path}` })
}
function checksPortable(checks: SchemaAST.Checks | undefined): boolean {
if (checks === undefined) return true
return checks.every((check) =>
check._tag === "Filter"
? !check.aborted &&
check.annotations?.meta !== undefined &&
typeof check.annotations.arbitrary === "object" &&
check.annotations.arbitrary !== null &&
"constraint" in check.annotations.arbitrary
: checksPortable(check.checks),
)
}
function metadataPortable(ast: SchemaAST.AST, seen: Set<SchemaAST.AST>): boolean {
if (seen.has(ast)) return true
seen.add(ast)
if (!annotationsPortable(ast.annotations) || !checksPortable(ast.checks)) return false
if ("encodingChecks" in ast && !checksPortable(ast.encodingChecks)) return false
if (ast.encoding?.some((link) => !metadataPortable(link.to, seen))) return false
if (SchemaAST.isDeclaration(ast)) return ast.typeParameters.every((item) => metadataPortable(item, seen))
if (SchemaAST.isSuspend(ast)) return metadataPortable(ast.thunk(), seen)
if (SchemaAST.isUnion(ast)) return ast.types.every((item) => metadataPortable(item, seen))
if (SchemaAST.isArrays(ast)) {
return (
ast.elements.every((item) => metadataPortable(item, seen)) &&
ast.rest.every((item) => metadataPortable(item, seen))
)
}
if (SchemaAST.isObjects(ast)) {
return (
ast.propertySignatures.every((field) => metadataPortable(field.type, seen)) &&
ast.indexSignatures.every(
(field) => metadataPortable(field.parameter, seen) && metadataPortable(field.type, seen),
)
)
}
return true
}
function generationPortable(generation: unknown): boolean {
if (typeof generation !== "object" || generation === null) return false
const value = generation as {
readonly runtime?: unknown
readonly Type?: unknown
readonly importDeclaration?: unknown
}
if (typeof value.runtime !== "string" || typeof value.Type !== "string") return false
if (value.importDeclaration !== undefined) {
if (
typeof value.importDeclaration !== "string" ||
!/from ["']effect(?:\/[^"']+)?["']$/.test(value.importDeclaration)
) {
return false
}
}
const namespace =
typeof value.importDeclaration === "string"
? /import(?: type)? \* as ([A-Za-z_$][\w$]*)/.exec(value.importDeclaration)?.[1]
: undefined
return value.runtime.startsWith("Schema.") || (namespace !== undefined && value.runtime.startsWith(`${namespace}.`))
}
function annotationsPortable(annotations: Schema.Annotations.Annotations | undefined) {
if (annotations === undefined) return true
return Object.entries(annotations).every(([key, value]) => {
if (
["toCodec", "toCodecJson", "toArbitrary", "toFormatter", "toEquivalence", "~effect/Schema/Class"].includes(key)
) {
return true
}
if (key === "generation") return generationPortable(value)
return serializable(value)
})
}
function serializable(value: unknown): boolean {
if (value === null || ["string", "number", "boolean"].includes(typeof value)) return true
if (Array.isArray(value)) return value.every(serializable)
if (typeof value !== "object") return false
return Object.values(value).every(serializable)
}
function taggedErrorFields(schema: Schema.Top) {
if (!SchemaAST.isDeclaration(schema.ast) || schema.ast.annotations?.["~effect/Schema/Class"] === undefined) {
return undefined
}
const fields = schema.ast.typeParameters[0]
if (!SchemaAST.isObjects(fields) || fields.indexSignatures.length > 0) return undefined
const tag = fields.propertySignatures.find((field) => field.name === "_tag")?.type
if (tag === undefined || !SchemaAST.isLiteral(tag) || typeof tag.literal !== "string") return undefined
return {
tag: tag.literal,
identifier: SchemaAST.resolveIdentifier(schema.ast) ?? tag.literal,
fields: fields.propertySignatures.flatMap((field) =>
field.name === "_tag" || typeof field.name !== "string" ? [] : [[field.name, Schema.make(field.type)] as const],
),
}
}
function isDataEnvelope(schema: Schema.Top) {
if (isStreamSchema(schema) || HttpApiSchema.isNoContent(schema.ast)) return false
const ast = Schema.toType(schema).ast
return (
SchemaAST.isObjects(ast) &&
ast.indexSignatures.length === 0 &&
ast.propertySignatures.length === 1 &&
ast.propertySignatures[0]?.name === "data"
)
}
function isStreamSchema(schema: Schema.Top): schema is HttpApiSchema.StreamSchema {
return "_tag" in schema && (schema._tag === "StreamSse" || schema._tag === "StreamUint8Array")
}
function streamDataSchema(schema: Extract<HttpApiSchema.StreamSchema, { readonly _tag: "StreamSse" }>) {
const ast = Schema.toType(schema.events).ast
if (!SchemaAST.isObjects(ast)) throw new GenerationError({ reason: "Invalid SSE data schema" })
const data = ast.propertySignatures.find((field) => field.name === "data")?.type
if (data === undefined) throw new GenerationError({ reason: "Invalid SSE data schema" })
return Schema.make(data)
}
function renderGroup(group: Group, groupIndex: number) {
const slots: Array<Slot> = []
const adapters: Array<string> = []
const endpointSources = group.endpoints.map(
(
{
endpoint,
errors,
headers: endpointHeaders,
params: endpointParams,
payloads: endpointPayloads,
query: endpointQuery,
successes,
},
endpointIndex,
) => {
const prefix = `Endpoint${endpointIndex}`
const params = addSlot(endpointParams, `${prefix}Params`)
const query = addSlot(endpointQuery, `${prefix}Query`)
const headers = addSlot(endpointHeaders, `${prefix}Headers`)
const payloads = endpointPayloads.map((schema, index) => addSlot(schema, `${prefix}Payload${index}`)!)
const success = renderSuccess(successes[0], `${prefix}Success`)
const errorSlots = errors.map((schema, index) => addSlot(schema, `${prefix}Error${index}`)!)
const options = [
params === undefined ? undefined : `params: ${params.name}`,
query === undefined ? undefined : `query: ${query.name}`,
headers === undefined ? undefined : `headers: ${headers.name}`,
payloads.length === 0
? undefined
: `payload: ${payloads.length === 1 ? payloads[0].name : `[${payloads.map((slot) => slot.name).join(", ")}]`}`,
`success: ${success.source}`,
errorSlots.length === 0
? undefined
: `error: ${errorSlots.length === 1 ? errorSlots[0].name : `[${errorSlots.map((slot) => slot.name).join(", ")}]`}`,
].filter((option): option is string => option !== undefined)
const operation = group.endpoints[endpointIndex]
if (operation === undefined) {
throw new GenerationError({ reason: `Missing operation: ${group.identifier}.${endpoint.name}` })
}
const schemaBySource = { params, query, headers, payload: payloads[0] }
const inputType = operation.input
.map((field) => {
const slot = schemaBySource[field.source]
if (slot === undefined) {
throw new GenerationError({ reason: `Missing input schema: ${group.identifier}.${endpoint.name}` })
}
return `readonly ${JSON.stringify(field.name)}${field.optional ? "?" : ""}: (typeof ${slot.name}.Type)[${JSON.stringify(field.name)}]`
})
.join("; ")
const argument =
operation.operation.inputMode === "none"
? ""
: `input${operation.operation.inputMode === "optional" ? "?" : ""}: ${prefix}Input`
const request = (["params", "query", "headers", "payload"] as const)
.flatMap((source) => {
const slot = schemaBySource[source]
if (slot === undefined) return []
const fields = operation.input
.filter((field) => field.source === source)
.map(
(field) =>
`${JSON.stringify(field.name)}: input${operation.operation.inputMode === "optional" ? "?." : ""}[${JSON.stringify(field.name)}]`,
)
return [`${source}: { ${fields.join(", ")} }`]
})
.join(", ")
const declared = [...errorSlots, ...(success.streamError === undefined ? [] : [success.streamError])]
const declaredSchema =
declared.length === 0 ? "Schema.Never" : `Schema.Union([${declared.map((slot) => slot.name).join(", ")}])`
const rawCall = `raw[${JSON.stringify(endpoint.name)}]({ ${request} })`
const mapped = `${rawCall}.pipe(Effect.mapError(map${prefix}Error)${operation.unwrapData ? ", Effect.map((value) => value.data)" : ""})`
const inputDeclaration =
operation.operation.inputMode === "none" ? "" : `type ${prefix}Input = { ${inputType} }\n`
adapters.push(
`${inputDeclaration}const ${prefix}DeclaredError = ${declaredSchema}\nconst map${prefix}Error = (error: unknown) => HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error) ? new ClientError({ cause: error }) : Schema.is(${prefix}DeclaredError)(error) ? error : new ClientError({ cause: error })\nconst ${prefix} = (raw: RawGroup) => (${argument}) => ${operation.operation.success === "stream" ? `Stream.unwrap(${rawCall}.pipe(Effect.mapError(map${prefix}Error), Effect.map((stream) => stream.pipe(Stream.mapError(map${prefix}Error)))))` : mapped}`,
)
return `HttpApiEndpoint.make(${JSON.stringify(endpoint.method)})(${JSON.stringify(endpoint.name)}, ${JSON.stringify(endpoint.path)}, { ${options.join(", ")} })`
},
)
function addSlot(schema: Schema.Top | undefined, name: string) {
if (schema === undefined) return undefined
const slot = { name, schema }
slots.push(slot)
return slot
}
function renderSuccess(schema: Schema.Top, name: string) {
if (!isStreamSchema(schema)) return { source: addSlot(schema, name)!.name }
const status = resolveHttpApiStatus(schema.ast) ?? 200
const annotate = status === 200 ? "" : `.pipe(HttpApiSchema.status(${status}))`
if (schema._tag === "StreamUint8Array") {
return {
source: `HttpApiSchema.StreamUint8Array({ contentType: ${JSON.stringify(schema.contentType)} })${annotate}`,
}
}
const value = addSlot(
schema.sseMode === "data" ? streamDataSchema(schema) : schema.events,
`${name}${schema.sseMode === "data" ? "Data" : "Events"}`,
)!
const error = addSlot(schema.error, `${name}Error`)!
return {
source: `HttpApiSchema.StreamSse({ ${schema.sseMode}: ${value.name}, error: ${error.name}, contentType: ${JSON.stringify(schema.contentType)} })${annotate}`,
streamError: error,
}
}
const declarations = renderSchemas(slots)
const groupSource = `HttpApiGroup.make(${JSON.stringify(group.identifier)}, { topLevel: ${group.endpoints[0]?.topLevel ?? false} })${endpointSources.map((endpoint) => `.add(${endpoint})`).join("")}`
const usesHttpApiSchema = endpointSources.some((source) => source.includes("HttpApiSchema."))
const methods = group.endpoints
.map((item, index) => `${JSON.stringify(item.endpoint.name)}: Endpoint${index}(raw)`)
.join(", ")
const rawGroup = group.endpoints[0]?.topLevel
? `HttpApiClient.Client<typeof Group${groupIndex}>`
: `HttpApiClient.Client.Group<typeof Group${groupIndex}, ${JSON.stringify(group.identifier)}, never, never>`
const usesStream = group.endpoints.some((item) => item.operation.success === "stream")
return `// Generated by @opencode-ai/httpapi-codegen. Do not edit.\nimport { Effect, Schema${usesStream ? ", Stream" : ""} } from "effect"\nimport { Sse } from "effect/unstable/encoding"\nimport { HttpClientError } from "effect/unstable/http"\nimport { HttpApiClient, HttpApiEndpoint, HttpApiGroup${usesHttpApiSchema ? ", HttpApiSchema" : ""} } from "effect/unstable/httpapi"\nimport { ClientError } from "./client-error"\n\n${declarations}\n\nexport const Group${groupIndex} = ${groupSource}\n\ntype RawGroup = ${rawGroup}\n\n${adapters.join("\n\n")}\n\nexport const adaptGroup${groupIndex} = (raw: RawGroup) => ({ ${methods} })\n`
}
function renderSchemas(slots: ReadonlyArray<Slot>) {
if (slots.length === 0) return ""
const classes = new Map(
slots.flatMap((slot, index) => {
const tagged = taggedErrorFields(slot.schema)
return tagged === undefined ? [] : [[index, tagged] as const]
}),
)
const expanded = [
...slots.map((slot, index) => (classes.has(index) ? { name: slot.name, schema: Schema.Never } : slot)),
...Array.from(classes.values()).flatMap((tagged, classIndex) =>
tagged.fields.map(([name, schema]) => ({ name: `Class${classIndex}${name}`, schema })),
),
]
const [first, ...rest] = expanded
const document = SchemaRepresentation.toCodeDocument(
SchemaRepresentation.fromASTs([first.schema.ast, ...rest.map((slot) => slot.schema.ast)]),
)
const artifacts = document.artifacts.flatMap((artifact) => {
if (artifact._tag === "Import") return [artifact.importDeclaration]
if (artifact._tag === "Enum") return [artifact.generation.runtime]
return [`const ${artifact.identifier} = ${artifact.generation.runtime}`]
})
const references = [
...document.references.nonRecursives.map(({ $ref, code }) => `const ${$ref} = ${code.runtime}`),
...Object.entries(document.references.recursives).map(
([$ref, code]) => `type ${$ref} = ${code.Type}\nconst ${$ref}: Schema.Codec<${$ref}> = ${code.runtime}`,
),
]
let fieldIndex = slots.length
const declarations = slots.map((slot, index) => {
const tagged = classes.get(index)
if (tagged === undefined) return `const ${slot.name} = ${document.codes[index].runtime}`
const fields = tagged.fields
.map(([name]) => `${JSON.stringify(name)}: ${document.codes[fieldIndex++].runtime}`)
.join(", ")
const annotations = Object.entries({
httpApiStatus: resolveHttpApiStatus(slot.schema.ast),
"~httpApiEncoding": resolveHttpApiEncoding(slot.schema.ast),
}).filter((entry) => entry[1] !== undefined)
const annotate =
annotations.length === 0
? ""
: `.annotate({ ${annotations.map(([key, value]) => `${JSON.stringify(key)}: ${JSON.stringify(value)}`).join(", ")} })`
return `class ${slot.name}Class extends Schema.TaggedErrorClass<${slot.name}Class>(${JSON.stringify(tagged.identifier)})(${JSON.stringify(tagged.tag)}, { ${fields} }) {}\nconst ${slot.name} = ${slot.name}Class${annotate}`
})
return [...artifacts, ...references, ...declarations].join("\n\n")
}
function renderClient(groups: ReadonlyArray<Group>) {
const imports = groups
.map((group, index) => `import { adaptGroup${index}, Group${index} } from ${JSON.stringify(`./${group.module}`)}`)
.join("\n")
const api = `HttpApi.make("generated")${groups.map((_, index) => `.add(Group${index})`).join("")}`
const fields = groups.flatMap((group, index) => {
if (!group.endpoints[0]?.topLevel) {
return [`${JSON.stringify(group.identifier)}: adaptGroup${index}(raw[${JSON.stringify(group.identifier)}])`]
}
const raw = `{ ${group.endpoints.map((item) => `${JSON.stringify(item.endpoint.name)}: raw[${JSON.stringify(item.endpoint.name)}]`).join(", ")} }`
return [`...adaptGroup${index}(${raw})`]
})
return `// Generated by @opencode-ai/httpapi-codegen. Do not edit.\nimport { Effect } from "effect"\nimport { HttpApi, HttpApiClient } from "effect/unstable/httpapi"\n${imports}\n\nconst Api = ${api}\n\nexport const make = (options?: { readonly baseUrl?: URL | string }) =>\n HttpApiClient.make(Api, options).pipe(Effect.map((raw) => ({ ${fields.join(", ")} })))\n`
}
+28
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@@ -0,0 +1,28 @@
import { test } from "bun:test"
import { Cause, Effect, Exit, Layer } from "effect"
import type { Scope } from "effect/Scope"
import { TestClock, TestConsole } from "effect/testing"
type Body<A, E, R> = Effect.Effect<A, E, R> | (() => Effect.Effect<A, E, R>)
const layer = Layer.mergeAll(TestConsole.layer, TestClock.layer())
const effect = <A, E>(name: string, body: Body<A, E, Scope>, options?: Parameters<typeof test>[2]) =>
test(
name,
() =>
Effect.gen(function* () {
const exit = yield* Effect.suspend(() => (typeof body === "function" ? body() : body)).pipe(
Effect.scoped,
Effect.provide(layer),
Effect.exit,
)
if (Exit.isFailure(exit)) {
yield* Effect.forEach(Cause.prettyErrors(exit.cause), Effect.logError, { discard: true })
}
return yield* exit
}).pipe(Effect.runPromise),
options,
)
export const it = { effect }
+45
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@@ -0,0 +1,45 @@
import { Schema } from "effect"
import { HttpApi, HttpApiEndpoint, HttpApiGroup, HttpApiSchema } from "effect/unstable/httpapi"
export class Missing extends Schema.TaggedErrorClass<Missing>()("Missing", {
message: Schema.String,
}) {}
export const Api = HttpApi.make("fixture")
.add(
HttpApiGroup.make("session")
.add(HttpApiEndpoint.get("health", "/session/health", { success: Schema.String }))
.add(
HttpApiEndpoint.get("list", "/session", {
query: { archived: Schema.optional(Schema.Boolean) },
success: Schema.Array(Schema.String),
}),
)
.add(
HttpApiEndpoint.get("get", "/session/:sessionID", {
params: { sessionID: Schema.String },
success: Schema.Struct({ data: Schema.String }),
error: Missing.pipe(HttpApiSchema.status(404)),
}),
)
.add(
HttpApiEndpoint.post("interrupt", "/session/:sessionID/interrupt", {
params: { sessionID: Schema.String },
success: HttpApiSchema.NoContent,
}),
),
)
.add(
HttpApiGroup.make("event").add(
HttpApiEndpoint.get("subscribe", "/event", {
success: HttpApiSchema.StreamSse({ data: Schema.Struct({ type: Schema.String }) }).pipe(
HttpApiSchema.status(202),
),
}),
),
)
.add(
HttpApiGroup.make("system", { topLevel: true }).add(
HttpApiEndpoint.get("status", "/status", { success: Schema.String }),
),
)
@@ -0,0 +1,470 @@
import { describe, expect, test } from "bun:test"
import { Effect, FileSystem, Schema, SchemaAST, SchemaGetter } from "effect"
import { HttpApi, HttpApiEndpoint, HttpApiGroup, HttpApiMiddleware, HttpApiSchema } from "effect/unstable/httpapi"
import { format } from "prettier"
import { compile, generate, GenerationError } from "../src"
import { it } from "./effect"
import { Api as FixtureApi } from "./fixture"
function api(endpoint: HttpApiEndpoint.Any) {
return HttpApi.make("test").add(HttpApiGroup.make("session").add(endpoint))
}
describe("HttpApiCodegen.generate", () => {
test("preserves public group and endpoint identifiers exactly", () => {
const output = compile(
HttpApi.make("test").add(
HttpApiGroup.make("session").add(HttpApiEndpoint.get("get", "/session/:sessionID", { success: Schema.String })),
),
)
expect(output.operations[0]).toMatchObject({ group: "session", name: "get" })
})
test("emits one client module per HttpApi group", () => {
const source = HttpApi.make("test")
.add(HttpApiGroup.make("session").add(HttpApiEndpoint.get("get", "/session", { success: Schema.String })))
.add(HttpApiGroup.make("tool").add(HttpApiEndpoint.get("list", "/tool", { success: Schema.String })))
const output = compile(source)
expect(output.files.map((file) => file.path)).toEqual([
"session.ts",
"tool.ts",
"client-error.ts",
"client.ts",
"index.ts",
])
})
test("emits syntactically valid TypeScript modules", () => {
const output = compile(
api(
HttpApiEndpoint.get("get", "/session/:sessionID", {
params: { sessionID: Schema.String },
success: Schema.Struct({ data: Schema.String }),
}),
),
)
const transpiler = new Bun.Transpiler({ loader: "ts" })
for (const file of output.files) expect(() => transpiler.transformSync(file.content)).not.toThrow()
})
it.effect("keeps the strict generated-consumer fixture current", () =>
Effect.gen(function* () {
const output = compile(FixtureApi)
const actual = yield* Effect.promise(() =>
Array.fromAsync(new Bun.Glob("*.ts").scan(new URL("generated", import.meta.url).pathname)),
)
expect(actual.sort((a, b) => a.localeCompare(b))).toEqual(
output.files.map((file) => file.path).sort((a, b) => a.localeCompare(b)),
)
yield* Effect.forEach(output.files, (file) =>
Effect.tryPromise(() =>
Promise.all([
Bun.file(new URL(`generated/${file.path}`, import.meta.url)).text(),
format(file.content, { parser: "typescript", semi: false, printWidth: 120 }),
]),
).pipe(Effect.map(([content, expected]) => expect(content).toBe(expected))),
)
}),
)
test("flattens transport input channels into one domain input", () => {
const output = compile(
api(
HttpApiEndpoint.post("prompt", "/session/:sessionID", {
params: { sessionID: Schema.String },
query: { resume: Schema.String },
headers: { traceID: Schema.String },
payload: Schema.Struct({ prompt: Schema.String }),
success: Schema.Struct({ data: Schema.String }),
}),
),
)
expect(output.operations[0]?.input).toEqual([
{ name: "sessionID", source: "params" },
{ name: "resume", source: "query" },
{ name: "traceID", source: "headers" },
{ name: "prompt", source: "payload" },
])
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain(
'params: { "sessionID": input["sessionID"] }',
)
})
test("uses no argument when an operation has no input fields", () => {
const output = compile(api(HttpApiEndpoint.get("health", "/health", { success: Schema.String })))
expect(output.operations[0]?.inputMode).toBe("none")
})
test("uses an optional object when every input field is optional", () => {
const output = compile(
api(
HttpApiEndpoint.get("list", "/session", {
query: { limit: Schema.optional(Schema.String) },
success: Schema.Array(Schema.String),
}),
),
)
expect(output.operations[0]?.inputMode).toBe("optional")
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain('input?.["limit"]')
})
test("regenerates standard HttpApi transport codecs from decoded schemas", () => {
const output = compile(
api(
HttpApiEndpoint.get("list", "/session", {
query: { archived: Schema.optional(Schema.Boolean) },
success: Schema.String,
}),
),
)
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain("Schema.Boolean")
})
test("uses a required object when any input field is required", () => {
const output = compile(
api(
HttpApiEndpoint.get("get", "/session/:sessionID", {
params: { sessionID: Schema.String },
query: { includeArchived: Schema.optional(Schema.String) },
success: Schema.String,
}),
),
)
expect(output.operations[0]?.inputMode).toBe("required")
})
test("rejects colliding input names across transport channels", () => {
expect(() =>
compile(
api(
HttpApiEndpoint.post("prompt", "/session/:id", {
params: { id: Schema.String },
payload: Schema.Struct({ id: Schema.String }),
success: Schema.Void,
}),
),
),
).toThrow("Input field collision: id")
})
test("rejects multiple payload alternatives until selection semantics are explicit", () => {
expect(() =>
compile(
api(
HttpApiEndpoint.post("prompt", "/session", {
payload: [Schema.Struct({ text: Schema.String }), Schema.Struct({ count: Schema.Number })],
success: Schema.String,
}),
),
),
).toThrow("Multiple payload schemas: session.prompt")
})
test("unwraps an exact data success envelope", () => {
const output = compile(
api(
HttpApiEndpoint.get("get", "/session/:sessionID", {
params: { sessionID: Schema.String },
success: Schema.Struct({ data: Schema.String }),
}),
),
)
expect(output.operations[0]?.success).toBe("value")
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain(
"Effect.map((value) => value.data)",
)
})
test("maps no-content success to void", () => {
const output = compile(
api(HttpApiEndpoint.post("interrupt", "/session/:sessionID/interrupt", { success: HttpApiSchema.NoContent })),
)
expect(output.operations[0]?.success).toBe("void")
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain('"httpApiStatus": 204')
})
test("preserves non-default empty response statuses", () => {
const output = compile(api(HttpApiEndpoint.post("create", "/session", { success: HttpApiSchema.Created })))
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain('"httpApiStatus": 201')
})
test("returns a non-envelope success unchanged", () => {
const output = compile(api(HttpApiEndpoint.get("health", "/health", { success: Schema.String })))
expect(output.operations[0]?.success).toBe("value")
})
test("rejects multiple success shapes until their public semantics are explicit", () => {
expect(() =>
compile(
api(
HttpApiEndpoint.get("get", "/session", {
success: [Schema.String, Schema.Number],
}),
),
),
).toThrow("Multiple success schemas: session.get")
})
test("models an SSE success as a direct stream", () => {
const output = compile(
api(
HttpApiEndpoint.get("subscribe", "/event", {
success: HttpApiSchema.StreamSse({ data: Schema.Struct({ type: Schema.String }) }),
}),
),
)
expect(output.operations[0]?.success).toBe("stream")
})
test("preserves annotated stream response statuses", () => {
const output = compile(
api(
HttpApiEndpoint.get("subscribe", "/event", {
success: HttpApiSchema.StreamSse({ data: Schema.String }).pipe(HttpApiSchema.status(202)),
}),
),
)
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain(
".pipe(HttpApiSchema.status(202))",
)
})
test("rejects schemas whose semantics cannot be emitted exactly", () => {
const OpaqueUrl = Schema.declare((input): input is URL => input instanceof URL)
expect(() => compile(api(HttpApiEndpoint.get("get", "/url", { success: OpaqueUrl })))).toThrow(
"Unportable schema: session.get.success",
)
})
test("rejects custom transformations hidden beneath standard HttpApi codecs", () => {
const QueryBoolean = Schema.Literals(["yes", "no"]).pipe(
Schema.decodeTo(Schema.Boolean, {
decode: SchemaGetter.transform((value) => value === "yes"),
encode: SchemaGetter.transform((value) => (value ? "yes" : "no")),
}),
)
expect(() =>
compile(
api(
HttpApiEndpoint.get("get", "/session", {
query: { archived: QueryBoolean },
success: Schema.String,
}),
),
),
).toThrow("Unportable schema: session.get.query")
})
test("rejects custom validation checks without portable metadata", () => {
const Positive = Schema.Number.check(Schema.makeFilter((value) => (value > 0 ? undefined : "positive")))
expect(() => compile(api(HttpApiEndpoint.get("get", "/session", { success: Positive })))).toThrow(
"Unportable schema: session.get.success",
)
})
test("rejects spoofed and aborted validation checks", () => {
const Spoofed = Schema.Number.check(
Schema.makeFilter(() => "always fails", { meta: { _tag: "isFinite" }, arbitrary: {} }),
)
const Aborted = Schema.Number.check(Schema.isFinite().abort())
expect(() => compile(api(HttpApiEndpoint.get("spoofed", "/session", { success: Spoofed })))).toThrow(
"Unportable schema: session.spoofed.success",
)
expect(() => compile(api(HttpApiEndpoint.get("aborted", "/session", { success: Aborted })))).toThrow(
"Unportable schema: session.aborted.success",
)
})
test("rejects altered wire-side schemas even when the codec transformation is canonical", () => {
const JsonNumber = Schema.toCodecJson(Schema.Number)
const link = JsonNumber.ast.encoding?.[0]
if (link === undefined) throw new Error("Expected JSON number encoding")
// This helper is present at runtime but omitted from the public declaration surface.
const replaceEncoding: unknown = Reflect.get(SchemaAST, "replaceEncoding")
if (typeof replaceEncoding !== "function") throw new Error("Expected SchemaAST.replaceEncoding")
const ast: unknown = replaceEncoding(JsonNumber.ast, [
new SchemaAST.Link(Schema.String.check(Schema.isMinLength(2)).ast, link.transformation),
])
if (!SchemaAST.isAST(ast)) throw new Error("Expected altered schema AST")
const Altered = Schema.make(ast)
expect(() => compile(api(HttpApiEndpoint.get("get", "/session", { success: Altered })))).toThrow(
"Unportable schema: session.get.success",
)
})
test("rejects lexical generation and annotation values", () => {
const Generated = Schema.declare((input): input is string => typeof input === "string").annotate({
generation: { runtime: "LocalOnly", Type: "string" },
})
const Annotated = Schema.declare((input): input is string => typeof input === "string").annotate({
custom: () => "local",
})
expect(() => compile(api(HttpApiEndpoint.get("generated", "/session", { success: Generated })))).toThrow(
"Unportable schema: session.generated.success",
)
expect(() => compile(api(HttpApiEndpoint.get("annotated", "/session", { success: Annotated })))).toThrow(
"Unportable schema: session.annotated.success",
)
})
test("preserves errors from server-only middleware", () => {
class Unauthorized extends Schema.TaggedErrorClass<Unauthorized>()("Unauthorized", {}) {}
class Authorization extends HttpApiMiddleware.Service<Authorization>()("Authorization", {
error: Unauthorized,
}) {}
const output = compile(
api(HttpApiEndpoint.get("get", "/session", { success: Schema.String }).middleware(Authorization)),
)
expect(output.operations[0]).toBeDefined()
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain(
'extends Schema.TaggedErrorClass<Endpoint0Error0Class>("Unauthorized")',
)
})
test("preserves tagged error response statuses", () => {
class Missing extends Schema.TaggedErrorClass<Missing>()("Missing", {}) {}
const output = compile(
api(
HttpApiEndpoint.get("get", "/session", {
success: Schema.String,
error: Missing.pipe(HttpApiSchema.status(404)),
}),
),
)
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain(
'Endpoint0Error0Class.annotate({ "httpApiStatus": 404 })',
)
})
test("supports every HttpApi method through the generic constructor", () => {
const output = compile(api(HttpApiEndpoint.make("TRACE")("trace", "/trace", { success: Schema.String })))
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain('HttpApiEndpoint.make("TRACE")')
})
test("uses safe unique module paths without changing public group identifiers", () => {
const output = compile(
HttpApi.make("test")
.add(HttpApiGroup.make("../session").add(HttpApiEndpoint.get("get", "/session", { success: Schema.String })))
.add(HttpApiGroup.make("GROUP-0").add(HttpApiEndpoint.get("list", "/session", { success: Schema.String }))),
)
expect(output.files.slice(0, 2).map((file) => file.path)).toEqual(["group-0.ts", "GROUP-0-1.ts"])
expect(output.files[0]?.content).toContain('HttpApiGroup.make("../session"')
})
test("reserves support module names case-insensitively", () => {
const output = compile(
HttpApi.make("test")
.add(HttpApiGroup.make("client").add(HttpApiEndpoint.get("get", "/client", { success: Schema.String })))
.add(HttpApiGroup.make("INDEX").add(HttpApiEndpoint.get("get", "/index", { success: Schema.String }))),
)
expect(output.files.slice(0, 2).map((file) => file.path)).toEqual(["client-0.ts", "INDEX-1.ts"])
})
test("keeps searching when a reserved-name fallback is also occupied", () => {
const output = compile(
HttpApi.make("test")
.add(HttpApiGroup.make("client-1").add(HttpApiEndpoint.get("first", "/first", { success: Schema.String })))
.add(HttpApiGroup.make("client").add(HttpApiEndpoint.get("second", "/second", { success: Schema.String }))),
)
expect(output.files.slice(0, 2).map((file) => file.path)).toEqual(["client-1.ts", "client-1-1.ts"])
})
test("rejects collisions in the flattened client namespace", () => {
expect(() =>
compile(
HttpApi.make("test")
.add(HttpApiGroup.make("status").add(HttpApiEndpoint.get("get", "/nested", { success: Schema.String })))
.add(
HttpApiGroup.make("system", { topLevel: true }).add(
HttpApiEndpoint.get("status", "/status", { success: Schema.String }),
),
),
),
).toThrow("Client name collision: status")
})
test("emits a usable raw type for top-level groups", () => {
const output = compile(
HttpApi.make("test").add(
HttpApiGroup.make("health", { topLevel: true }).add(
HttpApiEndpoint.get("check", "/health", { success: Schema.String }),
),
),
)
expect(output.files[0]?.content).toContain("type RawGroup = HttpApiClient.Client<typeof Group0")
})
it.effect("reports compiler failures in the generate Effect", () =>
Effect.gen(function* () {
const error = yield* generate(
api(
HttpApiEndpoint.get("get", "/url", {
success: Schema.declare((input): input is URL => input instanceof URL),
}),
),
{
directory: "/generated",
},
).pipe(Effect.flip)
expect(error).toBeInstanceOf(GenerationError)
if (error instanceof GenerationError) expect(error.reason).toBe("Unportable schema: session.get.success")
}).pipe(Effect.provideService(FileSystem.FileSystem, FileSystem.makeNoop({}))),
)
test("rejects required client middleware without an adapter", () => {
class SignedRequest extends HttpApiMiddleware.Service<SignedRequest>()("SignedRequest", {
requiredForClient: true,
}) {}
expect(() =>
compile(api(HttpApiEndpoint.get("get", "/session", { success: Schema.String }).middleware(SignedRequest))),
).toThrow("Client middleware requires adapter: SignedRequest")
})
test("maps transport and decode failures to one stable client error", () => {
const output = compile(
api(
HttpApiEndpoint.get("get", "/session", {
success: Schema.String,
}),
),
)
expect(output.operations[0]?.errors).toContain("ClientError")
expect(output.operations[0]?.errors).not.toContain("HttpClientError")
expect(output.operations[0]?.errors).not.toContain("SchemaError")
expect(output.files.find((file) => file.path === "session.ts")?.content).toContain(
"new ClientError({ cause: error })",
)
})
})
@@ -0,0 +1,28 @@
import { Effect, Stream } from "effect"
import { HttpClient } from "effect/unstable/http"
import { ClientError, make } from "./generated"
import { Missing } from "./fixture"
export const program = make().pipe(
Effect.map((client) => {
const health = client.session.health()
const list = client.session.list()
const filtered = client.session.list({ archived: true })
const get = client.session.get({ sessionID: "session" })
const interrupt = client.session.interrupt({ sessionID: "session" })
const status = client.status()
const subscribe = client.event.subscribe()
const _health: Effect.Effect<string, ClientError> = health
const _list: Effect.Effect<ReadonlyArray<string>, ClientError> = list
const _filtered: Effect.Effect<ReadonlyArray<string>, ClientError> = filtered
const _get: Effect.Effect<string, Missing | ClientError> = get
const _interrupt: Effect.Effect<void, ClientError> = interrupt
const _status: Effect.Effect<string, ClientError> = status
const _subscribe: Stream.Stream<{ readonly type: string }, ClientError> = subscribe
return { _health, _list, _filtered, _get, _interrupt, _status, _subscribe }
}),
)
const _requiresHttpClient: Effect.Effect<unknown, never, HttpClient.HttpClient> = program
@@ -0,0 +1,5 @@
import { Schema } from "effect"
export class ClientError extends Schema.TaggedErrorClass<ClientError>()("ClientError", {
cause: Schema.Defect(),
}) {}
@@ -0,0 +1,17 @@
// Generated by @opencode-ai/httpapi-codegen. Do not edit.
import { Effect } from "effect"
import { HttpApi, HttpApiClient } from "effect/unstable/httpapi"
import { adaptGroup0, Group0 } from "./session"
import { adaptGroup1, Group1 } from "./event"
import { adaptGroup2, Group2 } from "./system"
const Api = HttpApi.make("generated").add(Group0).add(Group1).add(Group2)
export const make = (options?: { readonly baseUrl?: URL | string }) =>
HttpApiClient.make(Api, options).pipe(
Effect.map((raw) => ({
session: adaptGroup0(raw["session"]),
event: adaptGroup1(raw["event"]),
...adaptGroup2({ status: raw["status"] }),
})),
)
@@ -0,0 +1,39 @@
// Generated by @opencode-ai/httpapi-codegen. Do not edit.
import { Effect, Schema, Stream } from "effect"
import { Sse } from "effect/unstable/encoding"
import { HttpClientError } from "effect/unstable/http"
import { HttpApiClient, HttpApiEndpoint, HttpApiGroup, HttpApiSchema } from "effect/unstable/httpapi"
import { ClientError } from "./client-error"
const Endpoint0SuccessData = Schema.Struct({ type: Schema.String })
const Endpoint0SuccessError = Schema.Never
export const Group1 = HttpApiGroup.make("event", { topLevel: false }).add(
HttpApiEndpoint.make("GET")("subscribe", "/event", {
success: HttpApiSchema.StreamSse({
data: Endpoint0SuccessData,
error: Endpoint0SuccessError,
contentType: "text/event-stream",
}).pipe(HttpApiSchema.status(202)),
}),
)
type RawGroup = HttpApiClient.Client.Group<typeof Group1, "event", never, never>
const Endpoint0DeclaredError = Schema.Union([Endpoint0SuccessError])
const mapEndpoint0Error = (error: unknown) =>
HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error)
? new ClientError({ cause: error })
: Schema.is(Endpoint0DeclaredError)(error)
? error
: new ClientError({ cause: error })
const Endpoint0 = (raw: RawGroup) => () =>
Stream.unwrap(
raw["subscribe"]({}).pipe(
Effect.mapError(mapEndpoint0Error),
Effect.map((stream) => stream.pipe(Stream.mapError(mapEndpoint0Error))),
),
)
export const adaptGroup1 = (raw: RawGroup) => ({ subscribe: Endpoint0(raw) })
@@ -0,0 +1,2 @@
export { ClientError } from "./client-error"
export { make } from "./client"
@@ -0,0 +1,96 @@
// Generated by @opencode-ai/httpapi-codegen. Do not edit.
import { Effect, Schema } from "effect"
import { Sse } from "effect/unstable/encoding"
import { HttpClientError } from "effect/unstable/http"
import { HttpApiClient, HttpApiEndpoint, HttpApiGroup } from "effect/unstable/httpapi"
import { ClientError } from "./client-error"
const Endpoint0Success = Schema.String
const Endpoint1Query = Schema.Struct({ archived: Schema.optionalKey(Schema.Union([Schema.Boolean, Schema.Undefined])) })
const Endpoint1Success = Schema.Array(Schema.String)
const Endpoint2Params = Schema.Struct({ sessionID: Schema.String })
const Endpoint2Success = Schema.Struct({ data: Schema.String })
class Endpoint2Error0Class extends Schema.TaggedErrorClass<Endpoint2Error0Class>("Missing")("Missing", {
message: Schema.String,
}) {}
const Endpoint2Error0 = Endpoint2Error0Class.annotate({ httpApiStatus: 404 })
const Endpoint3Params = Schema.Struct({ sessionID: Schema.String })
const Endpoint3Success = Schema.Void.annotate({ httpApiStatus: 204 })
export const Group0 = HttpApiGroup.make("session", { topLevel: false })
.add(HttpApiEndpoint.make("GET")("health", "/session/health", { success: Endpoint0Success }))
.add(HttpApiEndpoint.make("GET")("list", "/session", { query: Endpoint1Query, success: Endpoint1Success }))
.add(
HttpApiEndpoint.make("GET")("get", "/session/:sessionID", {
params: Endpoint2Params,
success: Endpoint2Success,
error: Endpoint2Error0,
}),
)
.add(
HttpApiEndpoint.make("POST")("interrupt", "/session/:sessionID/interrupt", {
params: Endpoint3Params,
success: Endpoint3Success,
}),
)
type RawGroup = HttpApiClient.Client.Group<typeof Group0, "session", never, never>
const Endpoint0DeclaredError = Schema.Never
const mapEndpoint0Error = (error: unknown) =>
HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error)
? new ClientError({ cause: error })
: Schema.is(Endpoint0DeclaredError)(error)
? error
: new ClientError({ cause: error })
const Endpoint0 = (raw: RawGroup) => () => raw["health"]({}).pipe(Effect.mapError(mapEndpoint0Error))
type Endpoint1Input = { readonly archived?: (typeof Endpoint1Query.Type)["archived"] }
const Endpoint1DeclaredError = Schema.Never
const mapEndpoint1Error = (error: unknown) =>
HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error)
? new ClientError({ cause: error })
: Schema.is(Endpoint1DeclaredError)(error)
? error
: new ClientError({ cause: error })
const Endpoint1 = (raw: RawGroup) => (input?: Endpoint1Input) =>
raw["list"]({ query: { archived: input?.["archived"] } }).pipe(Effect.mapError(mapEndpoint1Error))
type Endpoint2Input = { readonly sessionID: (typeof Endpoint2Params.Type)["sessionID"] }
const Endpoint2DeclaredError = Schema.Union([Endpoint2Error0])
const mapEndpoint2Error = (error: unknown) =>
HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error)
? new ClientError({ cause: error })
: Schema.is(Endpoint2DeclaredError)(error)
? error
: new ClientError({ cause: error })
const Endpoint2 = (raw: RawGroup) => (input: Endpoint2Input) =>
raw["get"]({ params: { sessionID: input["sessionID"] } }).pipe(
Effect.mapError(mapEndpoint2Error),
Effect.map((value) => value.data),
)
type Endpoint3Input = { readonly sessionID: (typeof Endpoint3Params.Type)["sessionID"] }
const Endpoint3DeclaredError = Schema.Never
const mapEndpoint3Error = (error: unknown) =>
HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error)
? new ClientError({ cause: error })
: Schema.is(Endpoint3DeclaredError)(error)
? error
: new ClientError({ cause: error })
const Endpoint3 = (raw: RawGroup) => (input: Endpoint3Input) =>
raw["interrupt"]({ params: { sessionID: input["sessionID"] } }).pipe(Effect.mapError(mapEndpoint3Error))
export const adaptGroup0 = (raw: RawGroup) => ({
health: Endpoint0(raw),
list: Endpoint1(raw),
get: Endpoint2(raw),
interrupt: Endpoint3(raw),
})
@@ -0,0 +1,25 @@
// Generated by @opencode-ai/httpapi-codegen. Do not edit.
import { Effect, Schema } from "effect"
import { Sse } from "effect/unstable/encoding"
import { HttpClientError } from "effect/unstable/http"
import { HttpApiClient, HttpApiEndpoint, HttpApiGroup } from "effect/unstable/httpapi"
import { ClientError } from "./client-error"
const Endpoint0Success = Schema.String
export const Group2 = HttpApiGroup.make("system", { topLevel: true }).add(
HttpApiEndpoint.make("GET")("status", "/status", { success: Endpoint0Success }),
)
type RawGroup = HttpApiClient.Client<typeof Group2>
const Endpoint0DeclaredError = Schema.Never
const mapEndpoint0Error = (error: unknown) =>
HttpClientError.isHttpClientError(error) || Schema.isSchemaError(error) || Sse.Retry.is(error)
? new ClientError({ cause: error })
: Schema.is(Endpoint0DeclaredError)(error)
? error
: new ClientError({ cause: error })
const Endpoint0 = (raw: RawGroup) => () => raw["status"]({}).pipe(Effect.mapError(mapEndpoint0Error))
export const adaptGroup2 = (raw: RawGroup) => ({ status: Endpoint0(raw) })
+160
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@@ -0,0 +1,160 @@
import { describe, expect } from "bun:test"
import { Effect, FileSystem, Option } from "effect"
import { write, type Output } from "../src"
import { it } from "./effect"
describe("HttpApiCodegen.write", () => {
it.effect("writes compiled files beneath the output directory", () => {
const writes: Array<{ readonly path: string; readonly content: string }> = []
const output: Output = {
operations: [],
files: [{ path: "session.ts", content: "export const session = {}" }],
}
return Effect.gen(function* () {
yield* write(output, "/generated")
expect(writes).toEqual([
{ path: "/generated/session.ts", content: "export const session = {}\n" },
{ path: "/generated/.httpapi-codegen.json", content: '[\n "session.ts"\n]\n' },
])
}).pipe(
Effect.provideService(
FileSystem.FileSystem,
FileSystem.makeNoop({
exists: () => Effect.succeed(false),
makeDirectory: () => Effect.void,
writeFileString: (path, content) => {
writes.push({ path, content })
return Effect.void
},
}),
),
)
})
it.effect("removes only stale files owned by the previous manifest", () => {
const removed: Array<string> = []
return write(
{
operations: [],
files: [{ path: "session.ts", content: "" }],
},
"/generated",
).pipe(
Effect.provideService(
FileSystem.FileSystem,
FileSystem.makeNoop({
exists: (path) => Effect.succeed(path.endsWith(".httpapi-codegen.json")),
makeDirectory: () => Effect.void,
readFileString: () => Effect.succeed('["old.ts", "session.ts"]'),
remove: (path) => {
removed.push(path)
return Effect.void
},
writeFileString: () => Effect.void,
}),
),
Effect.tap(() => Effect.sync(() => expect(removed).toEqual(["/generated/old.ts"]))),
)
})
it.effect("rejects unsafe and duplicate output paths before writing", () => {
const writes: Array<string> = []
return Effect.gen(function* () {
const error = yield* write(
{
operations: [],
files: [
{ path: "../outside.ts", content: "" },
{ path: "client.ts", content: "" },
{ path: "CLIENT.ts", content: "" },
],
},
"/generated",
).pipe(Effect.flip)
expect(error._tag).toBe("GenerationError")
expect(writes).toEqual([])
}).pipe(
Effect.provideService(
FileSystem.FileSystem,
FileSystem.makeNoop({
writeFileString: (path) => {
writes.push(path)
return Effect.void
},
}),
),
)
})
it.effect("rejects case-insensitive duplicate output paths", () => {
const writes: Array<string> = []
return Effect.gen(function* () {
const error = yield* write(
{
operations: [],
files: [
{ path: "client.ts", content: "" },
{ path: "CLIENT.ts", content: "" },
],
},
"/generated",
).pipe(Effect.flip)
expect(error._tag).toBe("GenerationError")
expect(error.reason).toBe("Duplicate output path: CLIENT.ts")
expect(writes).toEqual([])
}).pipe(
Effect.provideService(
FileSystem.FileSystem,
FileSystem.makeNoop({
writeFileString: (path) => {
writes.push(path)
return Effect.void
},
}),
),
)
})
it.effect("reserves the private manifest path", () =>
write({ operations: [], files: [{ path: ".httpapi-codegen.json", content: "" }] }, "/generated").pipe(
Effect.flip,
Effect.tap((error) => Effect.sync(() => expect(error.reason).toContain("Unsafe output path"))),
Effect.provideService(FileSystem.FileSystem, FileSystem.makeNoop({})),
),
)
it.effect("rejects existing symbolic-link output targets", () =>
write({ operations: [], files: [{ path: "session.ts", content: "" }] }, "/generated").pipe(
Effect.flip,
Effect.tap((error) => Effect.sync(() => expect(error.reason).toBe("Unsafe output path: session.ts"))),
Effect.provideService(
FileSystem.FileSystem,
FileSystem.makeNoop({
exists: (path) => Effect.succeed(path.endsWith("session.ts")),
makeDirectory: () => Effect.void,
stat: () =>
Effect.succeed({
type: "SymbolicLink",
mtime: Option.none(),
atime: Option.none(),
birthtime: Option.none(),
dev: 0,
ino: Option.none(),
mode: 0,
nlink: Option.none(),
uid: Option.none(),
gid: Option.none(),
rdev: Option.none(),
size: FileSystem.Size(0),
blksize: Option.none(),
blocks: Option.none(),
}),
}),
),
),
)
})
+8
View File
@@ -0,0 +1,8 @@
{
"$schema": "https://json.schemastore.org/tsconfig",
"extends": "@tsconfig/bun/tsconfig.json",
"compilerOptions": {
"lib": ["ESNext", "DOM", "DOM.Iterable"],
"noUncheckedIndexedAccess": false
}
}