39 lines
1.1 KiB
TypeScript
39 lines
1.1 KiB
TypeScript
import {parseAsync} from 'json2csv';
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export default function csv(input: any[], f: (err, data) => void) {
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parseAsync(input.map(e => flatten(e)), {includeEmptyRows: true})
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.then(csv => f(null, csv))
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.catch(err => f(err, null));
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}
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function flatten (data) { // flatten object: {a: {b: true}} -> {a.b: true}
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const result = {};
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function recurse (cur, prop) {
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if (Object(cur) !== cur || Object.keys(cur).length === 0) {
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result[prop] = cur;
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}
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else if (Array.isArray(cur)) {
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if (cur.length && (Object(cur[0]) !== cur || Object.keys(cur[0]).length === 0)) { // array of non-objects
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result[prop] = '[' + cur.join(', ') + ']';
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}
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else {
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let l = 0;
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for(let i = 0, l = cur.length; i < l; i++)
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recurse(cur[i], prop + "[" + i + "]");
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if (l == 0)
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result[prop] = [];
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}
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}
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else {
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let isEmpty = true;
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for (let p in cur) {
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isEmpty = false;
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recurse(cur[p], prop ? prop+"."+p : p);
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}
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if (isEmpty && prop)
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result[prop] = {};
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}
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}
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recurse(data, '');
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return result;
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} |