forked from jestjs/jest
/
normalizeDiffOptions.ts
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/
normalizeDiffOptions.ts
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import chalk = require('chalk');
import type {CompareKeys} from 'pretty-format';
import type {DiffOptions, DiffOptionsNormalized} from './types';
export const noColor = (string: string): string => string;
const DIFF_CONTEXT_DEFAULT = 5;
const OPTIONS_DEFAULT: DiffOptionsNormalized = {
aAnnotation: 'Expected',
aColor: chalk.green,
aIndicator: '-',
bAnnotation: 'Received',
bColor: chalk.red,
bIndicator: '+',
changeColor: chalk.inverse,
changeLineTrailingSpaceColor: noColor,
commonColor: chalk.dim,
commonIndicator: ' ',
commonLineTrailingSpaceColor: noColor,
compareKeys: undefined,
contextLines: DIFF_CONTEXT_DEFAULT,
emptyFirstOrLastLinePlaceholder: '',
expand: true,
includeChangeCounts: false,
omitAnnotationLines: false,
patchColor: chalk.yellow,
};
const getCompareKeys = (compareKeys?: CompareKeys): CompareKeys =>
compareKeys && typeof compareKeys === 'function'
? compareKeys
: OPTIONS_DEFAULT.compareKeys;
const getContextLines = (contextLines?: number): number =>
typeof contextLines === 'number' &&
Number.isSafeInteger(contextLines) &&
contextLines >= 0
? contextLines
: DIFF_CONTEXT_DEFAULT;
// Pure function returns options with all properties.
export const normalizeDiffOptions = (
options: DiffOptions = {},
): DiffOptionsNormalized => ({
...OPTIONS_DEFAULT,
...options,
compareKeys: getCompareKeys(options.compareKeys),
contextLines: getContextLines(options.contextLines),
});