Ramda Redact

redact.test.ts

import { redact } from './redact'

test('replaces given paths with [Redacted]', () => {
	const data = { secret: '1234', nested: { secret: '5678' } }
	const redactedData = redact([['secret'], ['nested', 'secret']], data)
	const curriedRedactedData = redact([['secret'], ['nested', 'secret']])(data)

	expect(redactedData).toMatchInlineSnapshot(`
		Object {
		  "nested": Object {
		    "secret": "[Redacted]",
		  },
		  "secret": "[Redacted]",
		}
	`)

	// ensure changes didn't mutate data
	expect(redactedData).not.toEqual(data)

	// ensure curried version of the function works
	expect(curriedRedactedData).toEqual(redactedData)
})

redact.ts

import R from 'ramda'

/**
 * Replaces values of provided paths in object with `[Redacted]`
 *
 * @param paths An array of ramda compatible path arrays
 * @param obj The object you want to redact
 */
export const redact = R.curry(function redact(paths: string[][], obj: object): object {
	let result = obj

	R.forEach<string[]>(path => {
		if (R.path(path, result)) {
			result = R.assocPath(path, '[Redacted]', result)
		}
	}, paths)

	return result
})