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Make ts-node eval public for node REPL consumption #1121

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merged 21 commits into from Dec 3, 2020
Merged

Make ts-node eval public for node REPL consumption #1121

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ffe2428
Add createReplEval function
MarcManiez Sep 3, 2020
6c3ecbf
Add a test
MarcManiez Sep 3, 2020
c064d71
Fix a couple of typos
MarcManiez Sep 3, 2020
b6eca72
Actually test the evaluator
MarcManiez Sep 3, 2020
ada5afd
Try removing spec
MarcManiez Sep 4, 2020
9ab7eca
Use service creation pattern
MarcManiez Sep 4, 2020
58354c3
Move REPL code to its own file
MarcManiez Sep 4, 2020
6d8a66f
Merge remote-tracking branch 'origin/master' into public-eval
cspotcode Nov 19, 2020
02c174a
- Reorder repl.ts declarations to match the original order from bin.ts
cspotcode Nov 20, 2020
95375d5
Expand ReplService API; use new API in bin.ts, which further decouple…
cspotcode Nov 20, 2020
7acec12
Add brief, internal docs for REPL API
cspotcode Nov 21, 2020
b2f13e3
Add support for DI of alternative stdio streams into REPL
cspotcode Nov 21, 2020
d539f40
export REPL from index.ts
cspotcode Nov 21, 2020
4164a37
remove unnecessary export
cspotcode Nov 21, 2020
9b834b0
Add test for new REPL API
cspotcode Nov 21, 2020
495475e
API surface, naming, docs tweaks
cspotcode Nov 21, 2020
80f67ed
tweak identifiers
cspotcode Nov 23, 2020
d610300
Merge remote-tracking branch 'origin/master' into public-eval
cspotcode Dec 3, 2020
354cb10
fix name
cspotcode Dec 3, 2020
7f1a7a2
Tweak repl API test to match REPL CLI test, allowing it to pass on Wi…
cspotcode Dec 3, 2020
5267c0b
Merge remote-tracking branch 'origin/master' into public-eval
cspotcode Dec 3, 2020
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6 changes: 6 additions & 0 deletions package-lock.json
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1 change: 1 addition & 0 deletions package.json
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Expand Up @@ -92,6 +92,7 @@
"@types/source-map-support": "^0.5.0",
"axios": "^0.19.0",
"chai": "^4.0.1",
"get-stream": "^6.0.0",
"lodash": "^4.17.15",
"mocha": "^6.2.2",
"ntypescript": "^1.201507091536.1",
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36 changes: 33 additions & 3 deletions src/index.spec.ts
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Expand Up @@ -10,7 +10,9 @@ import * as promisify from 'util.promisify'
import { sync as rimrafSync } from 'rimraf'
import { createRequire, createRequireFromPath } from 'module'
import { pathToFileURL } from 'url'
import Module = require('module')
import type * as Module from 'module'
import { PassThrough } from 'stream'
import * as getStream from 'get-stream'

const execP = promisify(exec)

Expand All @@ -25,7 +27,7 @@ const SOURCE_MAP_REGEXP = /\/\/# sourceMappingURL=data:application\/json;charset
const testsDirRequire = (createRequire || createRequireFromPath)(join(TEST_DIR, 'index.js')) // tslint:disable-line

// Set after ts-node is installed locally
let { register, create, VERSION }: typeof tsNodeTypes = {} as any
let { register, create, VERSION, createReplService }: typeof tsNodeTypes = {} as any

// Pack and install ts-node locally, necessary to test package "exports"
before(async function () {
Expand All @@ -34,7 +36,7 @@ before(async function () {
await execP(`npm install`, { cwd: TEST_DIR })
const packageLockPath = join(TEST_DIR, 'package-lock.json')
existsSync(packageLockPath) && unlinkSync(packageLockPath)
;({ register, create, VERSION } = testsDirRequire('ts-node'))
;({ register, create, VERSION, createReplService } = testsDirRequire('ts-node'))
})

describe('ts-node', function () {
Expand Down Expand Up @@ -370,6 +372,34 @@ describe('ts-node', function () {
cp.stdin!.end('\nconst a = 123\n.type a')
})

it('REPL can be created via API', async () => {
const stdin = new PassThrough()
const stdout = new PassThrough()
const stderr = new PassThrough()
const replService = createReplService({
stdin,
stdout,
stderr
})
const service = create(replService.evalStateAwareHostFunctions)
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As a newcomer, I experienced some confusion seeing the replService juxtaposed with the service. I noticed that the Register type applies to the service and that naming discrepancy was also a head-scratcher for me. With some digging, I kind of see what they represent.

Nothing immediately applicable, but just sharing some thoughts, as I recall y'all considering what might make the repo easier on newbies!

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@cspotcode cspotcode Nov 22, 2020 •
edited

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Yeah, I don't like the name of Register. IMO it should be Service so that if you do import {Service} from 'ts-node'; then it's intuitive. I'm guessing the Register name made more sense in the past. We can rename it to Service and export by the legacy Register name for backwards-compatibility.

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Another question:
Given that our create() function returns a Register, which I'd like to rename to Service, does it make sense to rename createReplService() to createRepl() for consistency? create(): Service, createRepl(): ReplService?

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Yes, I think that would make a lot more sense! I might even rename the ReplService type to TsRepl, or TsNodeRepl.

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I'm thinking it's best to avoid putting TsNode into the names of exports, to match TypeScript and node's APIs. For example:

  • import {Duplex} from 'streams'; (it's called Duplex, not DuplexStream)
  • import {LanguageService} from 'typescript'; It's named LanguageService instead of TsLanguageService, and lots of usages I've seen do a wildcard import to add the ts prefix: import * as ts from 'typescript'; ts.LanguageService

replService.setService(service)
replService.start()
stdin.write(
'const a = 123\n' +
'.type a\n'
)
stdin.end()
await promisify(setTimeout)(100)
stdout.end()
stderr.end()
expect(await getStream(stderr)).to.equal('')
expect(await getStream(stdout)).to.equal(
'> \'use strict\'\n' +
'> const a: 123\n' +
'> '
)
})

it('should support require flags', function (done) {
exec(`${cmd} -r ./tests/hello-world -pe "console.log('success')"`, function (err, stdout) {
expect(err).to.equal(null)
Expand Down