Using CodeLens for JavaScript in VSCode - javascript

I'm trying to get CodeLens working for a JavaScript project in VSCode. I've seen multiple sources indicate that this should work, but nothing with clear instructions on how to enable it besides the basic settings.
I have the following files in my workspace:
test.js
function test ( a, b ) {
return a + b;
}
test( 1, 2 );
jsconfig.json
{
"compilerOptions": {
"target": "ES5",
"checkJs": true
},
"include": [
"*"
]
}
And in my user settings I have the following:
"javascript.referencesCodeLens.enabled": true
(editor.codeLens is enabled by default.)
I've toggled and saved my preferences several times. I've restarted VSCode a few times as well. Still, I don't see any CodeLens information within my JavaScript.
Did I miss something? Am I doing something wrong? Do I even need the jsconfig.json file to enable this?
VSCode 1.17.0.

As of VS Code 1.17, we only show JS/TS references code lenses on classes, methods, and exports.
This issue tracks showing them in more locations, including on functions as in your example.

Related

How do I add global types to eslint/emmet in vscode?

NOTE: This is NOT a typescript question. I'm using JavaScript, not TypeScript
ESLint/Emmet in VSCode is aware of certain global types. For example: I type
const ctx = AudioC
And vscode/eslint/emmet auto completes it to AudioContext.
And if I continue and type
const ctx = new AudioContext();
ctx.create
it clearly knows the type since it provides completions for that type, not just that it's a global
How do I add new global completions/type data? For example these types
https://www.npmjs.com/package/#webgpu/types
even if I have to convert them to some other form
As it is VSCode/ESlint/Emmet are not aware of them.
Note: I'm not asking about /* global someName */ nor am I asking about "specifying globals". Neither of those adds new types.
Also note, I'm asking how to add them at a global level. In other words, if just create a new file and type
const a = GPUBufferUsage.
It needs to complete, the same as if I had typed
const b = navigator.
I didn't have to add any special comments or annotations to the file. the types are added at a global level.
half of the solution:
VSCode uses typescript to do its type completion even when in JavaScript
See VSCode docs: https://code.visualstudio.com/docs/nodejs/working-with-javascript
To add global types you can add a jsconfig.json file. The jsconfig.json file has the same format as a tsconfig.json file except it defaults to allowJs: true. Otherwise it's the same so you can configure it the same. For the referenced package above something like this seems to work
jsconfig.json
{
"compilerOptions": {
"target": "ESNext",
"module": "esnext",
"typeRoots": [
"./node_modules/#webgpu/types"
]
},
"exclude": ["node_modules", "**/node_modules/*"]
}
and adding the types for the package above with
npm install --save-dev #webgpu/types
This doesn't help eslint. It still complains. But you can manually add them to your .eslintrc file. For this particular file I extracted them with
grep "declare var" ./node_modules/#webgpu/types/dist/index.d.ts | sed 's/declare var \(.*\):.*$/"\1",/'
If there is an more standard way to get eslint to recognize those globals please add an answer.

New error when accessing properties of top "Object is possibly 'null'." after upgrading to TS 4.4.3

I recently upgraded my project to TypeScript 4.4.3 from 3.9.9.
My project's using "strictNullChecks": true, in its tsconfig.json, and runs in the browser, not server-side on Node.
In TypeScript 4.4.3, it seems like the type declarations for top has changed to WindowProxy | null (node_modules/typescript/lib/lib.dom.d.ts)
This means that I get the following error1 wherever I try to access properties of top2: TS Playground
const topUrl = top.window.location.href; // => Object is possibly 'null'.
How can I ignore this category of errors only for when top is possibly null?3
1 I understand that this error is warning me against the scenario where my website is loaded in an iframe, and therefore can't access top due to XSS. This isn't an issue because my 'X-Frame-Options' is set to 'sameorigin' and will therefore refuse to load my website in a cross-origin iframe.
2 I access properties of top because I use iframes inside my project a lot, where it loads sub-pages on the same domain.
3 I could use the following fixes to get around this Object is possibly 'null'., but I'd prefer not to, as my project is quite large and this fix would be tedious with minimal improvement.
let topUrl = top?.window.location.href || '';
let topUrl = '';
if (top) {
topUrl = top.window.location.href;
}
I could also ignore these errors on every line with // #ts-ignore, but there's a lot of references to top and I don't want to clutter the project (also, other TypeScript errors on the same line would be ignored).
// #ts-ignore
const topUrl = top.window.location.href;
I found a solution which would possibly fit your needs. And there are 2 versions of the solution you can take into consideration.
Both of these versions work by overriding the built-in lib-dom with a npm package #types/web which is also provided by Microsoft.
Beta but systematic one - Using the latest official 'lib override' from typescript#4.5.0-beta
Follow steps below and things are gonna work as you expect without any other code modifications:
Upgrade to TypeScript 4.5.0:
npm i -D typescript#4.5.0-beta
or install globally
npm i -g typescript#4.5.0-beta
Install the #types/web#0.0.1 type package which has top: Window type
npm i -D #typescript/lib-dom#npm:#types/web#0.0.1
I have made some simple tests on this solution and managed to get behaviour you want.
The only shortcoming of this solution is that typescript#4.5 is still beta currently. But It worth your consideration since its final release will be just on next month.
TypeScript 4.5 Iteration Plan
Stable one - typescript 4.4.3 and switch the built-in dom lib.
install #types/web
npm i -D #types/web#0.0.1
notice that the install command is different from the above one.
Update your tsconfig.json. There are two cases to consider depending on if you have lib defined in your tsconfig.json or not.
Without "lib" - You will need to add "lib": []. The value you want to add inside your lib should correlate to your "target". For example if you had "target": "es2017", then you would add "lib": ["es2017"]
With "lib" - You should remove "dom".
The drawback of this second version of solution is, it cannot prevent your dependencies in node_modules from pulling in the TypeScript DOM library.
Please bear in mind that despite #types/web is up to version 0.0.40, only version 0.0.1 of #types/web has top typed top: Window instead of top: WindowProxy | null which is what you need.
The problem
You decided to upgrade your compiler version, and, as mentioned in a comment, major software version changes almost always come with breaking API changes.
The correct way to solve your issue (prevent compiler errors) is to modify your source code to satisfy the compiler. You said that modifying your source code in this way would be a chore, and asked about modifying the compiler configuration instead such that you can avoid modifying your source code.
It is not possible to override the types in lib.dom.d.ts in new type declarations. TypeScript will emit additional errors if you attempt to do this, even if you disable type-checking of your new declaration file, resulting in an incompatible merging of your new declarations. Your only option is to exclude the built-in DOM library and provide your own modified version of it.
Here is an overview of how to do that:
Starting TSConfig
You haven't provided your tsconfig.json file, so here's an example to use as a base, with the assumption that your source is organized in your repo's src/ directory:
Note: "strict": true implies "strictNullChecks": true
{
"compilerOptions": {
"isolatedModules": true,
"lib": [
"esnext",
"dom",
"dom.iterable"
],
"module": "esnext",
"outDir": "dist",
"strict": true,
"target": "esnext"
},
"include": [
"./src/**/*"
]
}
Creating the modified lib.dom.d.ts library
First download the lib.dom.d.ts file from the tag that matches your TypeScript version (4.4.3): https://github.com/microsoft/TypeScript/blob/v4.4.3/lib/lib.dom.d.ts
Move the file to src/types/lib.dom.d.ts in your project
Remove the triple-slash reference on line 18 by deleting the entire line. (This will allow you to continue using other built-in libraries.)
Modify line 17286 from this:
readonly top: WindowProxy | null;
to this:
readonly top: WindowProxy;
Modify line 18350 from this:
declare var top: WindowProxy | null;
to this:
declare var top: WindowProxy;
Save the file
Modifying your TSConfig
Now that you have a replacement library for the DOM types in your program, you need to tell the compiler to use it that way. Here's what you need to change:
{
"compilerOptions": {
// ...
"lib": [
"esnext",
"dom", // Delete this from the array
"dom.iterable"
],
// ...
// Add this array property
"typeRoots": [
"./node_modules/#types",
"./src/types"
]
},
// ...
}
So the modified tsconfig.json now looks like this:
{
"compilerOptions": {
"isolatedModules": true,
"lib": [
"esnext",
"dom.iterable"
],
"module": "esnext",
"outDir": "dist",
"strict": true,
"target": "esnext",
"typeRoots": [
"./node_modules/#types",
"./src/types"
]
},
"include": [
"./src/**/*"
]
}
Conclusion
That's it. Now you should be able to compile your program and reference window.top or just the global top as a non-nullable value without a compiler error.
You'll need to repeat this process every time you upgrade TypeScript. Is this strategy more sustainable than modifying your source code? That's up to you.
I preface this answer with a strong warning that I would not do this to my project and encourage anyone in this position to fix the errors the proper way using null coalescing or not null assertion. EG:
window.top!.scrollTo()
top!.scrollTo()
window.top?.scrollTo()
top?.scrollTo()
// etc..
Even though theres 1500 I think using some regular expression you could easily target a large portion of those errors and fix with ease. With that said heres some other options:
I havent done this in a production project and might result in some other strange errors, its largely untested by myself outside of quick testing
The summary of this solution is you could clone the lib.dom.ts file and make the modifications by hand.
Copy ./node_modules/typescript/lib/lib.dom.d.ts to somewhere in your project, say ./lib.dom.modified-4.4.3.d.ts
Make the modifications to remove the null type from window.top and top types
// old
// readonly top: WindowProxy | null;
// new
readonly top: WindowProxy;
...
// old
// declare var top: WindowProxy | null;
// new
declare var top: WindowProxy;
Update your tsconfig.json to remove dom as one of the libraries and add it to the list of types
{
"compilerOptions": {
"lib": [
"ES6"
],
"strictNullChecks": true,
"module": "commonjs",
"target": "ES6",
"types": [
"./lib.dom.modified-4.4.3"
]
},
"include": [
"src/**/*"
]
}
Now you have a custom dom library with the top property not nullable
Alternatively you could make a patch for lib-dom using git and apply it post install. Details about how to do that are outlined in several solutions of this question How to overwrite incorrect TypeScript type definition installed via #types/package
You can initialize a VCS if you have not already done so. Then
look at the place of your error
see what you would need to replace it to
use whatever tools you use to replace all occurrences of the source text to the target text
if there are still errors, repeat
Once you have replaced all occurrences of issues this way, you will need to review your changes. You will find the changes via the VCS. If you use git, then the command is
git diff
See all the changes and whichever looks even a little bit suspect, investigate and see whether the automatic change was correct. If not, perform whatever you need to ensure that your code is correct.
Test everything. You would do well if you would create a separate versioning branch for this work which would be tested for a long time before it's being released to production.
instead that you shoud use !, that typescript ignores the fact that the value could be null which in your case it is not
const topUrl = top!.window.location.href;
if your ES-LINT complains on that you can set the in config file like that
module.exports = {
...
rules: {
...
'#typescript-eslint/no-non-null-assertion': 'off'
},
...
}
I access properties of top because I use iframes inside my project a lot, where it loads sub-pages on the same domain.
top is potentially null...
This isn't an issue because my 'X-Frame-Options' is set to 'sameorigin' and will therefore refuse to load my website in a cross-origin iframe.
But you're saying that's impossible, in which case...
function getTop(): NonNullable<typeof top> {
if (!top) throw new Error('global var top is null');
return top;
}
...then replace any occurrence of top.example with getTop().example so as to centralize all potential 'null' errors.
While this isn't the most simple solution, it should be the safest.
In your question, you state:
I could use the following fixes to get around this Object is possibly 'null'., but I'd prefer not to, as my project is quite large and this fix would be tedious with minimal improvement.
let topUrl = top?.window.location.href || '';
I can appreciate the tedious nature of this task, but if you're insistent on using TypeScript, I must also be insistent that you employ this solution. It is necessary in TypeScript.
One way I would solve this problem would be to use my code editor/IDE program to search/replace all text references in my project. I use Visual Studio Code which allows me to Search and Replace specific text in my source files. It allows for Regex searching, including and excluding particular files. I'm certain that a great majority of code editors/IDEs have similar functionality.

Linter error in Deno project tsconfig.json, and cascading into project files - but code runs successfully?

I need to use the ES2019 flatMap() method on an array in a Deno project, so I have created a tsconfig.json file as below:
{
"compilerOptions": {
"target": "es5",
"lib": [
"es2019"
]
}
}
This gives what appear to be 6 of the same linter errors, specifically Cannot find type definition file for 'cacheable-request' in the tsconfig.json file. Have I created this file incorrectly or somehow caused conflict with the Deno structure?
In a project module where I am attempting to use flatMap() I am seeing the error
Property 'flatMap' does not exist on type 'number[][]'. Do you need to change your target library? Try changing the `lib` compiler option to 'es2019' or later.
This doesn't make much sense since I have set my lib to es2019 in my tsonfig - unless I've created it wrong and it's thus not being picked up... then again the code works, so I'm assuming that it has correctly compiled to es2019.
Am I missing some aspect of creating a tsconfig file for a Deno project that allows use of es2019?
I believe there's no need normally to include a tsconfig.json in order to use ES2019 features in Deno. I was able to use flatMap without problems in Deno 1.9.0, for example:
// mod.ts
const map = [1,2,3,[1,2,3],[1,2]].flatMap((_value, _index, _array) => {
return 1;
});
console.log(map);
deno run mod.ts
>> [ 1, 1, 1, 1, 1 ]
I couldn't find if this was unsupported or bugged in previous versions but try upgrading Deno and omitting tsconfig.json to fix this.

Google Cloud Storage (Js), Async/Await & Cloud Functions Errors

THIS IS SOLVED ON GOOGLE SIDE NOW
Google Cloud NodeJs library now fix integrated. Keeping this question just for reference.
ORIGINAL QUESTION
I wanted my code to be clean(er) and used Typescript & async/await writing Cloud Functions accessing Google Cloud Storage.
Some important parts of my tsconfig.json:
{
"compilerOptions": {
"declaration": false,
"target": "es6",
"module": "commonjs",
"noImplicitAny": true,
"removeComments": true,
"noUnusedLocals": true,
"moduleResolution": "node",
"sourceMap": false,
"typeRoots": [
"node_modules/#types"
],
"lib": [
"es2016"
],
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"outDir": "./"
}
}
First error I had was ECONNRESET and I was making a call like this which probably caused it:
await bucket.file(path).download({
destination: tempFilePath
})
I've figured rest of the function did not wait till this line to be finished and whole function execution ends before file is downloaded from GCS to temp path.
So I've put that section into try/catch block:
try {
await bucket.file(path).download({
destination: tempFilePath
})
} catch (error) {
console.log(error);
}
It worked fine till today. Today I had this error:
convert: Empty input file '/temp/img-file.jpg'
which again made me think that next line (converting image size) is executed before file is downloaded from bucket to temp folder.
Am I missing something ?
Apparently I've made some errors due to fact that there are still many libraries out there not having proper type definitions, or not at all, including Google ones, and me making wrong guesses.
Be careful using libraries without Type Definitions and open their source to see return types.
While searching a solution I ran into this ansfer as well: GCS permissions related error and a bash script to fix. If you read this answer maybe your problem is related to that, so I share it here too.
UPDATE:
Again I've seen an error, so to double make sure I've included both async calls in try/catch:
let myBucket : any = {};
try {
myBucket = await googlecloudstorage.bucket('<bucket-id>');
await myBucket.file(path).download({
destination: tempFilePath
})
} catch (error) {
console.log(error);
}
UPDATE 2:
Still having errors, trying o figure it out within Typescript but I plan to go back to plain javascript. Also I've tried updating ACLs with a batch file as explained in issue I've provided link above, didn't seem to help.
UPDATE 3 (Hopeful to be last):
Well, for calls related to Google Cloud Storage I use plain javascript promises now and ditch async/await, like ones used in Firebase-Functions Samples repo, so far so good.
UPDATE 4:
I kept getting errors, after changing my code, upon uploads/reads inconsistently. Made further searches and...
Read this answer from another question describing same problem. Basically it's not us, it's them, but they don't admit. It's because the way google-cloud-node package uses sockets.
Will post it here if some sane way of fixing this comes up.
UPDATE 5:
Here is how not to keep sockets open forever:
var gcs = require('#google-cloud/storage')(...)
gcs.interceptors.push({
request: function(reqOpts) {
reqOpts.forever = false
return reqOpts
}
})
...seems to work, for now.

How to disable a ts rule for a specific line?

Summernote is a jQuery plugin, and I don't need type definitions for it. I just want to modify the object, but TS keeps throwing errors. The line bellow still gives me: "Property 'summernote' does not exist on type 'jQueryStatic'." error.
(function ($) {
/* tslint:disable */
delete $.summernote.options.keyMap.pc.TAB;
delete $.summernote.options.keyMap.mac.TAB;
/* tslint:enable */
})(jQuery)
Edit:
Here is my tsconfig.json
{
"compilerOptions": {
"outDir": "./dist/",
"sourceMap": true,
"noImplicitAny": true,
"module": "commonjs",
"target": "es5",
"allowJs": true,
"noUnusedParameters": true
},
"include": [
"js/**/*"
],
"exclude": [
"node_modules",
"**/*.spec.ts"
]
}
As of Typescript 2.6, you can now bypass a compiler error/warning for a specific line:
if (false) {
// #ts-ignore: Unreachable code error
console.log("hello");
}
Note that the official docs "recommend you use [this] very sparingly". It is almost always preferable to cast to any instead as that better expresses intent.
Older answer:
You can use /* tslint:disable-next-line */ to locally disable tslint. However, as this is a compiler error disabling tslint might not help.
You can always temporarily cast $ to any:
delete ($ as any).summernote.options.keyMap.pc.TAB
which will allow you to access whatever properties you want.
#ts-expect-error
TypeScript 3.9 introduces a new magic comment. #ts-expect-error will:
have same functionality as #ts-ignore
trigger an error, if actually no compiler error has been suppressed (= indicates useless flag)
if (false) {
// #ts-expect-error: Let's ignore a compile error like this unreachable code
console.log("hello"); // compiles
}
// If #ts-expect-error didn't suppress anything at all, we now get a nice warning
let flag = true;
// ...
if (flag) {
// #ts-expect-error
// ^~~~~~~~~~~~~~~^ error: "Unused '#ts-expect-error' directive.(2578)"
console.log("hello");
}
Playground
What do TypeScript developers recommend?
#ts-ignore and #ts-expect-error are like a sledgehammer for compile errors. TypeScript developers recommend more fine-grained, narrow-scoped typesystem solutions for most cases:
We added ts-ignore with the intent that it be used for the remaining 5% that can't be suppressed by any existing type system mechanics [...] there should be very very very few ts-ignores in your codebase[.] - microsoft/TypeScript#19139
[...] fundamentally, we believe you shouldn't be using suppressions in TypeScript at all. If it's a type issue, you can cast out of it (that's why any, casting, and shorthand module declarations exist). If it's a syntax issue, everything is awful and we'll be broken anyway, so suppressions won't do anything (suppressions do not affect parse errors). - microsoft/TypeScript#19573
Alternatives for question-case
▶ Use any type
// type assertion for single expression
delete ($ as any).summernote.options.keyMap.pc.TAB;
// new variable assignment for multiple usages
const $$: any = $
delete $$.summernote.options.keyMap.pc.TAB;
delete $$.summernote.options.keyMap.mac.TAB;
▶ Augment JQueryStatic interface
// ./global.d.ts
interface JQueryStatic {
summernote: any;
}
// ./main.ts
delete $.summernote.options.keyMap.pc.TAB; // works
In other cases, shorthand declarations / augmentations are handy utilities to compile modules with no / extendable types. A viable strategy is also to incrementally migrate to TypeScript, keeping not yet migrated code in .js via allowJs and checkJs: false compiler flags.
You can simple use the following just before the line:
// #ts-ignore
I used // #ts-ignore:next-line right before the error.
If you're using eslint to perform your check or fix you can disable a line by adding this on top of the line
// eslint-disable-next-line #typescript-eslint/<RELEVANT_ESLINT_RULE>

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