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Add support for babel.config.json (#10501)

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* Add support for babel.config.json root config

* Throw if multiple configuration files are found

* Add tests
This commit is contained in:
Devon Govett
2019-10-29 11:37:50 -07:00
committed by Nicolò Ribaudo
parent 38a3063111
commit 3a5e8a8dd4
6 changed files with 88 additions and 6 deletions
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36
packages/babel-core/src/config/files/configuration.js
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@@ -19,6 +19,11 @@ import type { CallerMetadata } from "../validation/options";
const debug = buildDebug("babel:config:loading:files:configuration");
const BABEL_CONFIG_JS_FILENAME = "babel.config.js";
const BABEL_CONFIG_JSON_FILENAME = "babel.config.json";
const ROOT_CONFIG_FILENAMES = [
BABEL_CONFIG_JS_FILENAME,
BABEL_CONFIG_JSON_FILENAME,
];
const BABELRC_FILENAME = ".babelrc";
const BABELRC_JS_FILENAME = ".babelrc.js";
@@ -27,7 +32,10 @@ const BABELIGNORE_FILENAME = ".babelignore";
export function findConfigUpwards(rootDir: string): string | null {
let dirname = rootDir;
while (true) {
if (fs.existsSync(path.join(dirname, BABEL_CONFIG_JS_FILENAME))) {
if (
fs.existsSync(path.join(dirname, BABEL_CONFIG_JS_FILENAME)) ||
fs.existsSync(path.join(dirname, BABEL_CONFIG_JSON_FILENAME))
) {
return dirname;
}
@@ -110,13 +118,29 @@ export function findRootConfig(
envName: string,
caller: CallerMetadata | void,
): ConfigFile | null {
const filepath = path.resolve(dirname, BABEL_CONFIG_JS_FILENAME);
const config = ROOT_CONFIG_FILENAMES.reduce(
(previousConfig: ConfigFile | null, name) => {
const filepath = path.resolve(dirname, name);
const config = readConfig(filepath, envName, caller);
const conf = readConfig(filepath, envName, caller);
if (conf) {
debug("Found root config %o in %o.", BABEL_CONFIG_JS_FILENAME, dirname);
if (config && previousConfig) {
throw new Error(
`Multiple configuration files found. Please remove one:\n` +
` - ${path.basename(previousConfig.filepath)}\n` +
` - ${name}\n` +
`from ${dirname}`,
);
}
return config || previousConfig;
},
null,
);
if (config) {
debug("Found configuration %o from %o.", config.filepath, dirname);
}
return conf;
return config;
}
export function loadConfig(