| 1 | 'use strict'
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| 2 |
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| 3 | const diff = require('variable-diff')
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| 4 | const disparity = require('disparity')
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| 5 | const is = require('check-more-types')
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| 6 |
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| 7 | const isMultiLineText = s => is.string(s) && s.includes('\n')
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| 8 | const areStrings = (s, t) => is.string(s) && is.string(t)
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| 9 | const compareAsStrings = (s, t) => areStrings(s, t) &&
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| 10 | (isMultiLineText(s) || isMultiLineText(t))
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| 11 |
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| 12 | function compareText (expected, value) {
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| 13 | const textDiff = disparity.unified(expected, value)
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| 14 | if (!textDiff) {
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| 15 | return {changed: false}
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| 16 | }
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| 17 | return {
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| 18 | changed: true,
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| 19 | text: textDiff
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| 20 | }
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| 21 | }
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| 22 |
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| 23 | const compareObjects = diff
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| 24 |
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| 25 | function compare ({expected, value}) {
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| 26 | const diffed = compareAsStrings(value, expected)
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| 27 | ? compareText(expected + '\n', value + '\n')
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| 28 | : compareObjects(expected, value)
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| 29 | if (diffed.changed) {
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| 30 | return {
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| 31 | valid: false,
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| 32 | message: `snapshot difference\n${diffed.text}`
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| 33 | }
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| 34 | }
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| 35 | return {
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| 36 | valid: true
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| 37 | }
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| 38 | }
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| 39 |
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| 40 | module.exports = compare
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