vue hello world项目
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"use strict";
const {
createWriteStream
} = require('fs');
const {
Readable
} = require('stream');
class StatsSerializeStream extends Readable {
constructor(stats) {
super();
this._indentLevel = 0;
this._stringifier = this._stringify(stats);
}
get _indent() {
return ' '.repeat(this._indentLevel);
}
_read() {
let readMore = true;
while (readMore) {
const {
value,
done
} = this._stringifier.next();
if (done) {
this.push(null);
readMore = false;
} else {
readMore = this.push(value);
}
}
}
*_stringify(obj) {
if (typeof obj === 'string' || typeof obj === 'number' || typeof obj === 'boolean' || obj === null) {
yield JSON.stringify(obj);
} else if (Array.isArray(obj)) {
yield '[';
this._indentLevel++;
let isFirst = true;
for (let item of obj) {
if (item === undefined) {
item = null;
}
yield `${isFirst ? '' : ','}\n${this._indent}`;
yield* this._stringify(item);
isFirst = false;
}
this._indentLevel--;
yield obj.length ? `\n${this._indent}]` : ']';
} else {
yield '{';
this._indentLevel++;
let isFirst = true;
const entries = Object.entries(obj);
for (const [itemKey, itemValue] of entries) {
if (itemValue === undefined) {
continue;
}
yield `${isFirst ? '' : ','}\n${this._indent}${JSON.stringify(itemKey)}: `;
yield* this._stringify(itemValue);
isFirst = false;
}
this._indentLevel--;
yield entries.length ? `\n${this._indent}}` : '}';
}
}
}
exports.StatsSerializeStream = StatsSerializeStream;
exports.writeStats = writeStats;
async function writeStats(stats, filepath) {
return new Promise((resolve, reject) => {
new StatsSerializeStream(stats).on('end', resolve).on('error', reject).pipe(createWriteStream(filepath));
});
}