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Handle ERR_REQUIRE_ESM when reading configuration #9573

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merged 4 commits into from Feb 16, 2020
Merged

Handle ERR_REQUIRE_ESM when reading configuration #9573

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e275a9f
Handle ERR_REQUIRE_ESM when reading configuration
azz Feb 15, 2020
c44f3d5
ESLint
azz Feb 15, 2020
8ba6ba8
Add an E2E test for package.json#type=module
azz Feb 16, 2020
0a09601
Rename importMjs -> importEsm
azz Feb 16, 2020
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64 changes: 29 additions & 35 deletions packages/jest-config/src/readConfigFileAndSetRootDir.ts
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Expand Up @@ -10,55 +10,49 @@ import * as fs from 'fs';
import {Config} from '@jest/types';
// @ts-ignore: vendored
import jsonlint from './vendor/jsonlint';
import {
JEST_CONFIG_EXT_JSON,
JEST_CONFIG_EXT_MJS,
PACKAGE_JSON,
} from './constants';
import {JEST_CONFIG_EXT_JSON, PACKAGE_JSON} from './constants';
import importMjs from './importMjs';

// Read the configuration and set its `rootDir`
// 1. If it's a `package.json` file, we look into its "jest" property
// 2. For any other file, we just require it.
// 2. For any other file, we just require it. If we receive an 'ERR_REQUIRE_ESM'
// from node, perform a dynamic import instead.
export default async function readConfigFileAndSetRootDir(
configPath: Config.Path,
): Promise<Config.InitialOptions> {
const isJSON = configPath.endsWith(JEST_CONFIG_EXT_JSON);
const isMjs = configPath.endsWith(JEST_CONFIG_EXT_MJS);
let configObject;

if (isMjs) {
try {
const importedConfig = await importMjs(configPath);
try {
configObject = require(configPath);
} catch (error) {
if (error.code === 'ERR_REQUIRE_ESM') {
try {
const importedConfig = await importMjs(configPath);
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if (!importedConfig.default) {
throw new Error(
`Jest: Failed to load mjs config file ${configPath} - did you use a default export?`,
);
}
if (!importedConfig.default) {
throw new Error(
`Jest: Failed to load mjs config file ${configPath} - did you use a default export?`,
);
}

configObject = importedConfig.default;
} catch (error) {
if (error.message === 'Not supported') {
throw new Error(
`Jest: Your version of Node does not support dynamic import - please enable it or use a .cjs file extension for file ${configPath}`,
);
}
configObject = importedConfig.default;
} catch (innerError) {
if (innerError.message === 'Not supported') {
throw new Error(
`Jest: Your version of Node does not support dynamic import - please enable it or use a .cjs file extension for file ${configPath}`,
);
}

throw error;
}
} else {
try {
configObject = require(configPath);
} catch (error) {
if (isJSON) {
throw new Error(
`Jest: Failed to parse config file ${configPath}\n` +
` ${jsonlint.errors(fs.readFileSync(configPath, 'utf8'))}`,
);
} else {
throw error;
throw innerError;
}
} else if (isJSON) {
throw new Error(
`Jest: Failed to parse config file ${configPath}\n` +
` ${jsonlint.errors(fs.readFileSync(configPath, 'utf8'))}`,
);
} else {
throw error;
}
}

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