Angular - Save Build Time At Package.json

build-date.js

const { writeFileSync } = require('fs')
const { join } = require('path')

const BUILD_DATE_TIME_STAMP_PATH = join(__dirname, 'build-date.json');

const createBuildDate = {
    buildDate: new Date()
}

writeFileSync(TIME_STAMP_PATH, JSON.stringify(createBuildDate, null, 2));  

package.json

"build": "node src/environments/build-date.js && ng build"

tsconfig.json

"resolveJsonModule": true,

you can use any file here i used file called build-date.json

My implementation for package.json

const { writeFileSync, readFileSync } = require('fs')

const { join } = require('path')

const packageInfo = JSON.parse(readFileSync(join(__dirname, '..', '..', '..', 'package.json')))

const BUILD_DATE_TIME_STAMP_PATH = join(__dirname, '..', '..', '..', 'package.json');

const createBuildDate = {
    ...packageInfo,
    build_version: new Date()
}

writeFileSync(BUILD_DATE_TIME_STAMP_PATH, JSON.stringify(createBuildDate, null, 2));  

My implementation for package.json

const { writeFileSync, readFileSync } = require('fs')

const { join } = require('path')

const packageInfo = JSON.parse(readFileSync(join(__dirname, '..', '..', '..', 'package.json')))

const BUILD_DATE_TIME_STAMP_PATH = join(__dirname, '..', '..', '..', 'package.json');

const createBuildDate = {
    ...packageInfo,
    build_version: new Date()
}

writeFileSync(BUILD_DATE_TIME_STAMP_PATH, JSON.stringify(createBuildDate, null, 2));  

Great @jackz7

thanks @Mustafa-Omran