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b60b7dacfa
The file system engine hosts for schematics were using a helper method to read JSON files that was performing both an exist and read call. Besides causing two file system calls, this also has a potential race condition where the file may not exist by the time the read call is made. To avoid this, a try/catch is used with the read call to handle the not existing case.
39 lines
1.0 KiB
TypeScript
39 lines
1.0 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.dev/license
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*/
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import { JsonValue } from '@angular-devkit/core';
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import { FileDoesNotExistException } from '@angular-devkit/schematics';
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import { readFileSync } from 'fs';
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import { ParseError, parse, printParseErrorCode } from 'jsonc-parser';
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export function readJsonFile(path: string): JsonValue {
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let data;
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try {
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data = readFileSync(path, 'utf-8');
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} catch (e) {
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if (e && typeof e === 'object' && 'code' in e && e.code === 'ENOENT') {
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throw new FileDoesNotExistException(path);
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}
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throw e;
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}
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const errors: ParseError[] = [];
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const content = parse(data, errors, { allowTrailingComma: true }) as JsonValue;
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if (errors.length) {
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const { error, offset } = errors[0];
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throw new Error(
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`Failed to parse "${path}" as JSON AST Object. ${printParseErrorCode(
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error,
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)} at location: ${offset}.`,
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);
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}
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return content;
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}
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