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60 lines
1.3 KiB
60 lines
1.3 KiB
4 years ago
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const path = require('path');
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const extension = require('./lib/extension');
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const normalize = require('./lib/normalize');
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const register = require('./lib/register');
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exports.prepare = function (extensions, filepath, cwd, nothrow) {
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var option, attempt;
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var attempts = [];
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var err;
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var onlyErrors = false;
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var ext = extension(filepath);
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if (Object.keys(require.extensions).indexOf(ext) !== -1) {
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return true;
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}
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var config = normalize(extensions[ext]);
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if (!config) {
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if (nothrow) {
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return;
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} else {
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throw new Error('No module loader found for "'+ext+'".');
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}
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}
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if (!cwd) {
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cwd = path.dirname(path.resolve(filepath));
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}
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if (!Array.isArray(config)) {
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config = [config];
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}
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for (var i in config) {
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option = config[i];
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attempt = register(cwd, option.module, option.register);
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error = (attempt instanceof Error) ? attempt : null;
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if (error) {
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attempt = null;
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}
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attempts.push({
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moduleName: option.module,
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module: attempt,
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error: error
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});
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if (!error) {
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onlyErrors = false;
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break;
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} else {
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onlyErrors = true;
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}
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}
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if (onlyErrors) {
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err = new Error('Unable to use specified module loaders for "'+ext+'".');
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err.failures = attempts;
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if (nothrow) {
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return err;
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} else {
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throw err;
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}
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}
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return attempts;
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};
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