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68 lines
2.0 KiB
68 lines
2.0 KiB
const { ESLint } = require('eslint');
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const eslintrc = require('../../../.eslintrc.js');
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/**
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* The singleton ESLint instance.
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*
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* @type {ESLint}
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*/
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let eslintInstance;
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// We only need a single ESLint instance, and we only initialize it if necessary
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const initializeESLint = () => {
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if (!eslintInstance) {
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eslintInstance = new ESLint({ baseConfig: eslintrc, useEslintrc: false });
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}
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};
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// Four spaces
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const TAB = ' ';
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module.exports = {
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lintTransformedFile,
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};
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/**
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* Lints a transformed file by invoking ESLint programmatically on the string
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* file contents. The path to the file must be specified so that the repository
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* ESLint config can be applied properly.
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*
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* An error is thrown if linting produced any errors, or if the file is ignored
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* by ESLint. Files linted by this function should never be ignored.
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*
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* @param {string} content - The file content.
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* @param {string} filePath - The path to the file.
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* @returns {Promise<void>} Returns `undefined` or throws an error if linting produced
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* any errors, or if the linted file is ignored.
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*/
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async function lintTransformedFile(content, filePath) {
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initializeESLint();
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const lintResult = (
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await eslintInstance.lintText(content, { filePath, warnIgnored: false })
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)[0];
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// This indicates that the file is ignored, which should never be the case for
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// a transformed file.
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if (lintResult === undefined) {
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throw new Error(
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`MetaMask build: Transformed file "${filePath}" appears to be ignored by ESLint.`,
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);
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}
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// This is the success case
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if (lintResult.errorCount === 0) {
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return;
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}
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// Errors are stored in the messages array, and their "severity" is 2
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const errorsString = lintResult.messages
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.filter(({ severity }) => severity === 2)
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.reduce((allErrors, { message, ruleId }) => {
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return allErrors.concat(`${TAB}${ruleId}\n${TAB}${message}\n\n`);
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}, '');
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throw new Error(
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`MetaMask build: Lint errors encountered for transformed file "${filePath}":\n\n${errorsString}`,
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);
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}
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