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76 lines
2.1 KiB
76 lines
2.1 KiB
2 years ago
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const npm = {
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stream: require('stream'),
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util: require('util')
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};
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/////////////////////////////////////
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// Checks if the value is a promise;
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function isPromise(value) {
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return value && typeof value.then === 'function';
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}
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////////////////////////////////////////////
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// Checks object for being a readable stream;
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function isReadableStream(obj) {
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return obj instanceof npm.stream.Stream &&
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typeof obj._read === 'function' &&
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typeof obj._readableState === 'object';
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}
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////////////////////////////////////////////////////////////
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// Sets an object property as read-only and non-enumerable.
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function extend(obj, name, value) {
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Object.defineProperty(obj, name, {
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value: value,
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configurable: false,
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enumerable: false,
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writable: false
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});
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}
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///////////////////////////////////////////
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// Returns a space gap for console output;
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function messageGap(level) {
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return ' '.repeat(level * 4);
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}
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function formatError(error, level) {
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const names = ['BatchError', 'PageError', 'SequenceError'];
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let msg = npm.util.inspect(error);
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if (error instanceof Error) {
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if (names.indexOf(error.name) === -1) {
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const gap = messageGap(level);
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msg = msg.split('\n').map((line, index) => {
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return (index ? gap : '') + line;
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}).join('\n');
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} else {
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msg = error.toString(level);
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}
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}
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return msg;
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}
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////////////////////////////////////////////////////////
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// Adds prototype inspection, with support of the newer
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// Custom Inspection, which was added in Node.js 6.x
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function addInspection(type, cb) {
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// istanbul ignore next;
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if (npm.util.inspect.custom) {
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// Custom inspection is supported:
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type.prototype[npm.util.inspect.custom] = cb;
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} else {
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// Use classic inspection:
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type.prototype.inspect = cb;
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}
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}
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module.exports = {
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addInspection: addInspection,
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formatError: formatError,
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isPromise: isPromise,
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isReadableStream: isReadableStream,
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messageGap: messageGap,
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extend: extend
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};
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