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@istanbuljs/load-nyc-config

The utility function which NYC uses to load configuration. This can be used by outside programs to calculate the configuration. Command-line arguments are not considered by this function.

const {loadNycConfig} = require('@istanbuljs/load-nyc-config');

(async () {
  console.log(await loadNycConfig());
})();

loadNycConfig([options])

options.cwd

Type: string Default: cwd from parent nyc process or process.cwd()

options.nycrcPath

Type: string Default: undefined

Name of the file containing nyc configuration. This can be a relative or absolute path. Relative paths can exist at options.cwd or any parent directory. If an nycrc is specified but cannot be found an exception is thrown.

If no nycrc option is provided the default priority of config files are:

.nycrc
.nycrc.json
.nycrc.yml
.nycrc.yaml
nyc.config.js
nyc.config.cjs
nyc.config.mjs

Configuration merging

Configuration is first loaded from package.json if found, this serves as the package defaults. These options can be overridden by an nycrc if found. Arrays are not merged, so if package.json sets "require": ["@babel/register"] and .nycrc sets "require": ["esm"] the effective require setting will only include "esm".

isLoading

const {isLoading} = require('@istanbuljs/load-nyc-config');

console.log(isLoading());

In some cases source transformation hooks can get installed before the configuration is loaded. This allows hooks to ignore source loads that occur during configuration load.