Command
build
Description
With @angular/build@22.2.0-rc.0, the default Oxc linker fails to process a partial ɵɵngDeclareClassMetadataAsync declaration whose resolveMetadata callback returns a parenthesized object literal. The same input builds successfully with NG_BUILD_BABEL_LINKER=1.
The fixture below is hand-reduced from Angular 22.1.7 output for a library component containing @defer; it removes the original application's dependencies and UI. It exercises the real ng build pipeline, not a mock linker.
Is this a regression?
The original library artifact passes our stable Angular 20/21/22 CI matrix and fails the 22.2.0-rc.0 canary. I have not bisected the first affected version using this reduced reproduction.
Minimal Reproduction
Create an empty directory with the following files, then run:
npm install
npm run build
# Fails: Unsupported syntax, expected an object literal.
npm run build:babel
# Succeeds: same input, Babel linker.
The build cache is disabled in this reproduction.
Complete minimal project files
package.json
{
"name": "angular-oxc-deferred-metadata-repro",
"version": "1.0.0",
"private": true,
"type": "module",
"scripts": {
"build": "ng build",
"build:babel": "NG_BUILD_BABEL_LINKER=1 ng build"
},
"dependencies": {
"@angular/core": "22.2.0-rc.0",
"@angular/common": "22.2.0-rc.0",
"@angular/compiler": "22.2.0-rc.0",
"@angular/platform-browser": "22.2.0-rc.0",
"rxjs": "7.8.2",
"tslib": "2.8.1",
"deferred-metadata-fixture": "file:./fixture"
},
"devDependencies": {
"@angular/build": "22.2.0-rc.0",
"@angular/cli": "22.2.0-rc.0",
"@angular/compiler-cli": "22.2.0-rc.0",
"typescript": "6.0.3"
}
}angular.json
{
"version": 1,
"cli": {
"cache": {
"enabled": false
},
"analytics": false
},
"projects": {
"repro": {
"projectType": "application",
"root": "",
"architect": {
"build": {
"builder": "@angular/build:application",
"options": {
"browser": "src/main.ts",
"tsConfig": "tsconfig.json",
"index": "src/index.html",
"outputPath": "dist",
"optimization": false
}
}
}
}
}
}tsconfig.json
{
"compilerOptions": {
"target": "ES2022",
"module": "preserve",
"moduleResolution": "bundler",
"experimentalDecorators": true,
"skipLibCheck": true,
"strict": true,
"lib": [
"ES2022",
"DOM"
]
},
"files": [
"src/main.ts"
]
}src/main.ts
import { Component } from '@angular/core';
import { bootstrapApplication } from '@angular/platform-browser';
import { DeferredFixture } from 'deferred-metadata-fixture';
@Component({ selector: 'app-root', template: 'Linker reproduction' })
class App {
constructor() { console.log(DeferredFixture); }
}
bootstrapApplication(App).catch(console.error);src/index.html
<!doctype html><html><head><title>Reproduction</title><base href="/"></head><body><app-root></app-root></body></html>
fixture/package.json
{
"name": "deferred-metadata-fixture",
"version": "1.0.0",
"type": "module",
"main": "index.mjs",
"types": "index.d.ts"
}fixture/index.mjs
import * as i0 from '@angular/core';
export class DeferredFixture {}
// Reduced from Angular 22.1.7 output for a component containing @defer.
// The parenthesized object returned by resolveMetadata triggers the failure.
i0.ɵɵngDeclareClassMetadataAsync({
minVersion: '18.0.0',
version: '22.1.7',
ngImport: i0,
type: DeferredFixture,
resolveDeferredDeps: () => [],
resolveMetadata: () => ({
decorators: [],
ctorParameters: null,
propDecorators: null,
}),
});fixture/index.d.ts
export declare class DeferredFixture {}
Additional control: in fixture/index.mjs, replace resolveMetadata: () => ({ ... }) with the equivalent resolveMetadata: () => { return { ... }; }. Running npm run build then succeeds with the default Oxc linker. This was verified locally, in addition to the Babel comparison.
Expected: both equivalent callback forms link successfully with the default builder.
Actual: only the parenthesized expression form fails.
Exception or Error
Unsupported syntax, expected an object literal. [plugin angular-compiler]
at OxcAstHost.parseObjectLiteral (.../oxc-ast-host.js:95:19)
at _AstObject.parse
at _AstValue.getObject
at PartialClassMetadataAsyncLinkerVersion1.linkPartialDeclaration
at FileLinker.linkPartialDeclaration
at OxcLinker.linkCallExpression
Your Environment
Angular CLI: 22.2.0-rc.0
Angular: 22.2.0-rc.0
@angular/build: 22.2.0-rc.0
@angular/compiler-cli: 22.2.0-rc.0
TypeScript: 6.0.3
Node.js: 26.5.0
npm: 11.17.0
OS: darwin arm64
The original failure also occurs on Ubuntu CI with Node 24.17.0.
Anything else relevant?
The parser represents the concise arrow body as ParenthesizedExpression(ObjectExpression). OxcAstHost.parseReturnValue() returns the body unchanged; the subsequent object-literal check only accepts ObjectExpression. Unwrapping the parenthesized return expression before interpreting the metadata appears to be the required fix.
Related PR #33769 addresses parentheses when emitting JavaScript, whereas this failure occurs when reading the callback's return value.
Command
build
Description
With
@angular/build@22.2.0-rc.0, the default Oxc linker fails to process a partialɵɵngDeclareClassMetadataAsyncdeclaration whoseresolveMetadatacallback returns a parenthesized object literal. The same input builds successfully withNG_BUILD_BABEL_LINKER=1.The fixture below is hand-reduced from Angular 22.1.7 output for a library component containing
@defer; it removes the original application's dependencies and UI. It exercises the realng buildpipeline, not a mock linker.Is this a regression?
The original library artifact passes our stable Angular 20/21/22 CI matrix and fails the 22.2.0-rc.0 canary. I have not bisected the first affected version using this reduced reproduction.
Minimal Reproduction
Create an empty directory with the following files, then run:
The build cache is disabled in this reproduction.
Complete minimal project files
package.json{ "name": "angular-oxc-deferred-metadata-repro", "version": "1.0.0", "private": true, "type": "module", "scripts": { "build": "ng build", "build:babel": "NG_BUILD_BABEL_LINKER=1 ng build" }, "dependencies": { "@angular/core": "22.2.0-rc.0", "@angular/common": "22.2.0-rc.0", "@angular/compiler": "22.2.0-rc.0", "@angular/platform-browser": "22.2.0-rc.0", "rxjs": "7.8.2", "tslib": "2.8.1", "deferred-metadata-fixture": "file:./fixture" }, "devDependencies": { "@angular/build": "22.2.0-rc.0", "@angular/cli": "22.2.0-rc.0", "@angular/compiler-cli": "22.2.0-rc.0", "typescript": "6.0.3" } }angular.json{ "version": 1, "cli": { "cache": { "enabled": false }, "analytics": false }, "projects": { "repro": { "projectType": "application", "root": "", "architect": { "build": { "builder": "@angular/build:application", "options": { "browser": "src/main.ts", "tsConfig": "tsconfig.json", "index": "src/index.html", "outputPath": "dist", "optimization": false } } } } } }tsconfig.json{ "compilerOptions": { "target": "ES2022", "module": "preserve", "moduleResolution": "bundler", "experimentalDecorators": true, "skipLibCheck": true, "strict": true, "lib": [ "ES2022", "DOM" ] }, "files": [ "src/main.ts" ] }src/main.tssrc/index.htmlfixture/package.json{ "name": "deferred-metadata-fixture", "version": "1.0.0", "type": "module", "main": "index.mjs", "types": "index.d.ts" }fixture/index.mjsfixture/index.d.tsAdditional control: in
fixture/index.mjs, replaceresolveMetadata: () => ({ ... })with the equivalentresolveMetadata: () => { return { ... }; }. Runningnpm run buildthen succeeds with the default Oxc linker. This was verified locally, in addition to the Babel comparison.Expected: both equivalent callback forms link successfully with the default builder.
Actual: only the parenthesized expression form fails.
Exception or Error
Your Environment
The original failure also occurs on Ubuntu CI with Node 24.17.0.
Anything else relevant?
The parser represents the concise arrow body as
ParenthesizedExpression(ObjectExpression).OxcAstHost.parseReturnValue()returns the body unchanged; the subsequent object-literal check only acceptsObjectExpression. Unwrapping the parenthesized return expression before interpreting the metadata appears to be the required fix.Related PR #33769 addresses parentheses when emitting JavaScript, whereas this failure occurs when reading the callback's return value.