N Akita's Blog

Deno 2.0 ​

Workspaces and monorepos ​

Directory Structure ​

.
├── deno.json
├── main.ts
└── packages
    ├── add
    │   ├── deno.json
    │   └── index.ts
    └── subtract
        ├── deno.json
        └── index.ts

 workspaceの属性を使用。

json
{
  "workspace": ["packages/add", "packages/subtract"]
}

packages/add ​

ts
export function add(a: number, b: number): number {
  return a + b
}
json
{
  "name": "@deno/add",
  "exports": "./index.ts"
}

packages/subtract ​

ts
import { add } from '@deno/add'

export function subtract(a: number, b: number): number {
  return add(a, -b)
}
json
{
  "name": "@deno/subtract",
  "exports": "./index.ts"
}
ts
import { add } from '@deno/add'
import { subtract } from '@deno/subtract'

console.log('Hello Deno')

const add_res = add(1, 2)
console.log(add_res)

const subtract_res = subtract(1, 2)
console.log(subtract_res)
sh
deno main.ts
Hello Deno
3
-1

Points to note ​

json
{
  "name": "@deno/add"
}

 "exports":を指定しないと、

sh
deno main.ts
Warning "exports" field should be specified when specifying a "name".
    at file:///workspaces/deno-workspaces-test/packages/add/deno.json
error: Unknown export '.' for '@deno/add'.
  Package exports:

    at file:///workspaces/deno-workspaces-test/main.ts:1:21

Package management ​

  • Package management with new deno install, deno add, and deno remove commands

deno add ​

 バージョン指定しない場合、最新のパッケージ。

sh
deno add npm:hono
json
{
  "dependencies": {
    "hono": "^4.6.4"
  }
}

 パッケージ名の後ろに「@バージョン」をつけて行うことも可能。

sh
deno add npm:hono@4.0.0
json
{
  "dependencies": {
    "hono": "^4.0.0"
  }
}

--dev ​

 バージョン指定しない場合、最新のパッケージ。

sh
deno add --dev npm:vitest
json
{
  "devDependencies": {
    "vitest": "^2.1.2"
  }
}

 パッケージ名の後ろに「@バージョン」をつけて行うことも可能。

sh
deno add --dev npm:vitest@2.0.1
json
{
  "devDependencies": {
    "vitest": "^2.0.1"
  }
}

deno remove ​

remove before ​

json
{
  "dependencies": { "hono": "^4.6.4" },
  "devDependencies": {
    "vitest": "^2.1.3"
  }
}
sh
deno remove hono
Removed hono

remove after ​

json
{
  "devDependencies": { "vitest": "^2.1.3" }
}

remove before ​

json
{
  "devDependencies": { "vitest": "^2.1.3" }
}
sh
deno remove vitest

remove after ​

json
{}

Points to note ​

 deno addの時は、npm:honoだが、deno removeと時は、honoと指定する。

sh
deno remove npm:hono
No packages were removed

 removeの時は、バージョンを指定しても削除できません。

sh
deno remove npm:hono@4.0.0
No packages were removed
sh
deno remove hono@4.0.0
No packages were removed

 removeの時は、--devを使用しても削除できません。

sh
deno remove --dev vitest
error: unexpected argument '--dev' found

  tip: to pass '--dev' as a value, use '-- --dev'

Usage: deno remove [OPTIONS] [packages]...

deno install ​

 以下のような機能と同様。

  • npm install

  • pnpm install

  • yarn install

  • bun install

sh
deno install

Vitest Example ​

Directory Structure ​

.
├── deno.json
├── package.json
├── packages
│   └── fizz-buzz
│       ├── deno.json
│       ├── index.test.ts
│       └── index.ts
└── src
    └── index.ts
ts
import { fizzBuzz } from '@deno/fizz-buzz'

const fizz_buzz_result = fizzBuzz(15)
console.log(fizz_buzz_result)
sh
deno src/index.ts
FizzBuzz
ts
export const fizzBuzz = (number: number): string => {
  if (number % 15 === 0) return 'FizzBuzz'
  if (number % 3 === 0) return 'Fizz'
  if (number % 5 === 0) return 'Buzz'
  return number.toString()
}
ts
import { describe, expect, it } from 'vitest'
import { fizzBuzz } from './index.ts'

// deno-fmt-ignore
const input: number[] = [
  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27,
  28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75,
  76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99,
  100,
]

// deno-fmt-ignore
const expected: string[] = [
  '1',
  '2',
  'Fizz',
  '4',
  'Buzz',
  'Fizz',
  '7',
  '8',
  'Fizz',
  'Buzz',
  '11',
  'Fizz',
  '13',
  '14',
  'FizzBuzz',
  '16',
  '17',
  'Fizz',
  '19',
  'Buzz',
  'Fizz',
  '22',
  '23',
  'Fizz',
  'Buzz',
  '26',
  'Fizz',
  '28',
  '29',
  'FizzBuzz',
  '31',
  '32',
  'Fizz',
  '34',
  'Buzz',
  'Fizz',
  '37',
  '38',
  'Fizz',
  'Buzz',
  '41',
  'Fizz',
  '43',
  '44',
  'FizzBuzz',
  '46',
  '47',
  'Fizz',
  '49',
  'Buzz',
  'Fizz',
  '52',
  '53',
  'Fizz',
  'Buzz',
  '56',
  'Fizz',
  '58',
  '59',
  'FizzBuzz',
  '61',
  '62',
  'Fizz',
  '64',
  'Buzz',
  'Fizz',
  '67',
  '68',
  'Fizz',
  'Buzz',
  '71',
  'Fizz',
  '73',
  '74',
  'FizzBuzz',
  '76',
  '77',
  'Fizz',
  '79',
  'Buzz',
  'Fizz',
  '82',
  '83',
  'Fizz',
  'Buzz',
  '86',
  'Fizz',
  '88',
  '89',
  'FizzBuzz',
  '91',
  '92',
  'Fizz',
  '94',
  'Buzz',
  'Fizz',
  '97',
  '98',
  'Fizz',
  'Buzz',
]

const testCases = input.map((i, o) => {
  return { input: i, expected: expected[o] }
})

describe('fizzBuzz test', () => {
  // fizzBuzz
  it.concurrent.each(testCases)('fizzBuzz($input) -> $expected', ({ input, expected }) => {
    const result = fizzBuzz(input)
    expect(result).toEqual(expected)
  })
})

Test ​

 package.jsonのscriptsからでも実行可能。

  • deno task can now run package.json scripts
json
{
  "scripts": {
    "test": "vitest"
  },
  "devDependencies": {
    "vitest": "^2.1.2"
  }
}
sh
deno task test
json
{
  "tasks": {
    "vitest": "vitest"
  }
}
sh
deno task test
Details
sh
Task test vitest

 DEV  v2.1.2 /workspaces/deno-workspaces-test

 ✓ packages/fizz-buzz/index.test.ts (100)
   ✓ fizzBuzz test (100)
     ✓ fizzBuzz(1) -> '1'
     ✓ fizzBuzz(2) -> '2'
     ✓ fizzBuzz(3) -> 'Fizz'
     ✓ fizzBuzz(4) -> '4'
     ✓ fizzBuzz(5) -> 'Buzz'
     ✓ fizzBuzz(6) -> 'Fizz'
     ✓ fizzBuzz(7) -> '7'
     ✓ fizzBuzz(8) -> '8'
     ✓ fizzBuzz(9) -> 'Fizz'
     ✓ fizzBuzz(10) -> 'Buzz'
     ✓ fizzBuzz(11) -> '11'
     ✓ fizzBuzz(12) -> 'Fizz'
     ✓ fizzBuzz(13) -> '13'
     ✓ fizzBuzz(14) -> '14'
     ✓ fizzBuzz(15) -> 'FizzBuzz'
     ✓ fizzBuzz(16) -> '16'
     ✓ fizzBuzz(17) -> '17'
     ✓ fizzBuzz(18) -> 'Fizz'
     ✓ fizzBuzz(19) -> '19'
     ✓ fizzBuzz(20) -> 'Buzz'
     ✓ fizzBuzz(21) -> 'Fizz'
     ✓ fizzBuzz(22) -> '22'
     ✓ fizzBuzz(23) -> '23'
     ✓ fizzBuzz(24) -> 'Fizz'
     ✓ fizzBuzz(25) -> 'Buzz'
     ✓ fizzBuzz(26) -> '26'
     ✓ fizzBuzz(27) -> 'Fizz'
     ✓ fizzBuzz(28) -> '28'
     ✓ fizzBuzz(29) -> '29'
     ✓ fizzBuzz(30) -> 'FizzBuzz'
     ✓ fizzBuzz(31) -> '31'
     ✓ fizzBuzz(32) -> '32'
     ✓ fizzBuzz(33) -> 'Fizz'
     ✓ fizzBuzz(34) -> '34'
     ✓ fizzBuzz(35) -> 'Buzz'
     ✓ fizzBuzz(36) -> 'Fizz'
     ✓ fizzBuzz(37) -> '37'
     ✓ fizzBuzz(38) -> '38'
     ✓ fizzBuzz(39) -> 'Fizz'
     ✓ fizzBuzz(40) -> 'Buzz'
     ✓ fizzBuzz(41) -> '41'
     ✓ fizzBuzz(42) -> 'Fizz'
     ✓ fizzBuzz(43) -> '43'
     ✓ fizzBuzz(44) -> '44'
     ✓ fizzBuzz(45) -> 'FizzBuzz'
     ✓ fizzBuzz(46) -> '46'
     ✓ fizzBuzz(47) -> '47'
     ✓ fizzBuzz(48) -> 'Fizz'
     ✓ fizzBuzz(49) -> '49'
     ✓ fizzBuzz(50) -> 'Buzz'
     ✓ fizzBuzz(51) -> 'Fizz'
     ✓ fizzBuzz(52) -> '52'
     ✓ fizzBuzz(53) -> '53'
     ✓ fizzBuzz(54) -> 'Fizz'
     ✓ fizzBuzz(55) -> 'Buzz'
     ✓ fizzBuzz(56) -> '56'
     ✓ fizzBuzz(57) -> 'Fizz'
     ✓ fizzBuzz(58) -> '58'
     ✓ fizzBuzz(59) -> '59'
     ✓ fizzBuzz(60) -> 'FizzBuzz'
     ✓ fizzBuzz(61) -> '61'
     ✓ fizzBuzz(62) -> '62'
     ✓ fizzBuzz(63) -> 'Fizz'
     ✓ fizzBuzz(64) -> '64'
     ✓ fizzBuzz(65) -> 'Buzz'
     ✓ fizzBuzz(66) -> 'Fizz'
     ✓ fizzBuzz(67) -> '67'
     ✓ fizzBuzz(68) -> '68'
     ✓ fizzBuzz(69) -> 'Fizz'
     ✓ fizzBuzz(70) -> 'Buzz'
     ✓ fizzBuzz(71) -> '71'
     ✓ fizzBuzz(72) -> 'Fizz'
     ✓ fizzBuzz(73) -> '73'
     ✓ fizzBuzz(74) -> '74'
     ✓ fizzBuzz(75) -> 'FizzBuzz'
     ✓ fizzBuzz(76) -> '76'
     ✓ fizzBuzz(77) -> '77'
     ✓ fizzBuzz(78) -> 'Fizz'
     ✓ fizzBuzz(79) -> '79'
     ✓ fizzBuzz(80) -> 'Buzz'
     ✓ fizzBuzz(81) -> 'Fizz'
     ✓ fizzBuzz(82) -> '82'
     ✓ fizzBuzz(83) -> '83'
     ✓ fizzBuzz(84) -> 'Fizz'
     ✓ fizzBuzz(85) -> 'Buzz'
     ✓ fizzBuzz(86) -> '86'
     ✓ fizzBuzz(87) -> 'Fizz'
     ✓ fizzBuzz(88) -> '88'
     ✓ fizzBuzz(89) -> '89'
     ✓ fizzBuzz(90) -> 'FizzBuzz'
     ✓ fizzBuzz(91) -> '91'
     ✓ fizzBuzz(92) -> '92'
     ✓ fizzBuzz(93) -> 'Fizz'
     ✓ fizzBuzz(94) -> '94'
     ✓ fizzBuzz(95) -> 'Buzz'
     ✓ fizzBuzz(96) -> 'Fizz'
     ✓ fizzBuzz(97) -> '97'
     ✓ fizzBuzz(98) -> '98'
     ✓ fizzBuzz(99) -> 'Fizz'
     ✓ fizzBuzz(100) -> 'Buzz'

 Test Files  1 passed (1)
      Tests  100 passed (100)
   Start at  12:41:35
   Duration  283ms (transform 36ms, setup 0ms, collect 41ms, tests 6ms, environment 0ms, prepare 105ms)

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