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fix(ngcc): do not emit ES2015 code in ES5 files (#33514)

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Previously, ngcc's `Renderer` would add some constants in the processed
files which were emitted as ES2015 code (e.g. `const` declarations).
This would result in invalid ES5 generated code that would break when
run on browsers that do not support the emitted format.

This commit fixes it by adding a `printStatement()` method to
`RenderingFormatter`, which can convert statements to JavaScript code in
a suitable format for the corresponding `RenderingFormatter`.
Additionally, the `translateExpression()` and `translateStatement()`
ngtsc helper methods are augmented to accept an extra hint to know
whether the code needs to be translated to ES5 format or not.

Fixes #32665

PR Close #33514
This commit is contained in:
George Kalpakas
2019-11-04 19:29:01 +02:00
committed by Kara Erickson
parent 21bd8c9a2e
commit 06e36e5972
17 changed files with 222 additions and 55 deletions
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25
packages/compiler-cli/ngcc/src/rendering/esm_rendering_formatter.ts
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@ -5,10 +5,12 @@
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {Statement} from '@angular/compiler';
import MagicString from 'magic-string';
import * as ts from 'typescript';
import {relative, dirname, AbsoluteFsPath, absoluteFromSourceFile} from '../../../src/ngtsc/file_system';
import {Import, ImportManager} from '../../../src/ngtsc/translator';
import {NOOP_DEFAULT_IMPORT_RECORDER, Reexport} from '../../../src/ngtsc/imports';
import {Import, ImportManager, translateStatement} from '../../../src/ngtsc/translator';
import {isDtsPath} from '../../../src/ngtsc/util/src/typescript';
import {CompiledClass} from '../analysis/types';
import {NgccReflectionHost, POST_R3_MARKER, PRE_R3_MARKER, SwitchableVariableDeclaration} from '../host/ngcc_host';
@ -16,13 +18,14 @@ import {ModuleWithProvidersInfo} from '../analysis/module_with_providers_analyze
import {ExportInfo} from '../analysis/private_declarations_analyzer';
import {RenderingFormatter, RedundantDecoratorMap} from './rendering_formatter';
import {stripExtension} from './utils';
import {Reexport} from '../../../src/ngtsc/imports';
import {isAssignment} from '../host/esm2015_host';
/**
* A RenderingFormatter that works with ECMAScript Module import and export statements.
*/
export class EsmRenderingFormatter implements RenderingFormatter {
protected printer = ts.createPrinter({newLine: ts.NewLineKind.LineFeed});
constructor(protected host: NgccReflectionHost, protected isCore: boolean) {}
/**
@ -225,6 +228,24 @@ export class EsmRenderingFormatter implements RenderingFormatter {
});
}
/**
* Convert a `Statement` to JavaScript code in a format suitable for rendering by this formatter.
*
* @param stmt The `Statement` to print.
* @param sourceFile A `ts.SourceFile` that provides context for the statement. See
* `ts.Printer#printNode()` for more info.
* @param importManager The `ImportManager` to use for managing imports.
*
* @return The JavaScript code corresponding to `stmt` (in the appropriate format).
*/
printStatement(stmt: Statement, sourceFile: ts.SourceFile, importManager: ImportManager): string {
const node = translateStatement(
stmt, importManager, NOOP_DEFAULT_IMPORT_RECORDER, ts.ScriptTarget.ES2015);
const code = this.printer.printNode(ts.EmitHint.Unspecified, node, sourceFile);
return code;
}
protected findEndOfImports(sf: ts.SourceFile): number {
for (const stmt of sf.statements) {
if (!ts.isImportDeclaration(stmt) && !ts.isImportEqualsDeclaration(stmt) &&