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import _ from 'lodash';
import type { Difference, DifferenceStatus } from './json-diff.types';
export { diff };
function diff(
obj: unknown,
newObj: unknown,
{ onlyShowDifferences = false }: { onlyShowDifferences?: boolean } = {},
): Difference {
if (_.isArray(obj) && _.isArray(newObj)) {
return {
key: '',
type: 'array',
children: diffArrays(obj, newObj, { onlyShowDifferences }),
oldValue: obj,
value: newObj,
status: getStatus(obj, newObj),
};
}
if (_.isObject(obj) && _.isObject(newObj)) {
return {
key: '',
type: 'object',
children: diffObjects(obj as Record<string, unknown>, newObj as Record<string, unknown>, { onlyShowDifferences }),
oldValue: obj,
value: newObj,
status: getStatus(obj, newObj),
};
}
return {
key: '',
type: 'value',
oldValue: obj,
value: newObj,
status: getStatus(obj, newObj),
};
}
function diffObjects(
obj: Record<string, unknown>,
newObj: Record<string, unknown>,
{ onlyShowDifferences = false }: { onlyShowDifferences?: boolean } = {},
): Difference[] {
const keys = Object.keys({ ...obj, ...newObj });
return keys
.map(key => createDifference(obj?.[key], newObj?.[key], key, { onlyShowDifferences }))
.filter(diff => !onlyShowDifferences || diff.status !== 'unchanged');
}
function createDifference(
value: unknown,
newValue: unknown,
key: string | number,
{ onlyShowDifferences = false }: { onlyShowDifferences?: boolean } = {},
): Difference {
const type = getType(value);
if (type === 'object') {
return {
key,
type,
children: diffObjects(value as Record<string, unknown>, newValue as Record<string, unknown>, {
onlyShowDifferences,
}),
oldValue: value,
value: newValue,
status: getStatus(value, newValue),
};
}
if (type === 'array') {
return {
key,
type,
children: diffArrays(value as unknown[], newValue as unknown[], { onlyShowDifferences }),
value: newValue,
oldValue: value,
status: getStatus(value, newValue),
};
}
return {
key,
type,
value: newValue,
oldValue: value,
status: getStatus(value, newValue),
};
}
function diffArrays(
arr: unknown[],
newArr: unknown[],
{ onlyShowDifferences = false }: { onlyShowDifferences?: boolean } = {},
): Difference[] {
const maxLength = Math.max(0, arr?.length, newArr?.length);
return Array.from({ length: maxLength }, (_, i) =>
createDifference(arr?.[i], newArr?.[i], i, { onlyShowDifferences }),
).filter(diff => !onlyShowDifferences || diff.status !== 'unchanged');
}
function getType(value: unknown): 'object' | 'array' | 'value' {
if (value === null) {
return 'value';
}
if (Array.isArray(value)) {
return 'array';
}
if (typeof value === 'object') {
return 'object';
}
return 'value';
}
function getStatus(value: unknown, newValue: unknown): DifferenceStatus {
if (value === undefined) {
return 'added';
}
if (newValue === undefined) {
return 'removed';
}
const bothAreObjects = getType(value) === 'object' && getType(newValue) === 'object';
const bothAreArrays = getType(value) === 'array' && getType(newValue) === 'array';
const bothAreDeepEqual = _.isEqual(value, newValue);
if (bothAreDeepEqual) {
return 'unchanged';
}
if (bothAreObjects || bothAreArrays) {
return 'children-updated';
}
return 'updated';
}
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