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prefer-string-starts-ends-with: add suggestions for safely handling non-strings #1277

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bmish
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@bmish bmish commented May 14, 2021

Fixes #1267.

@bmish bmish force-pushed the prefer-string-starts-ends-with-suggestions branch from 991a7c3 to 458dfdb Compare May 14, 2021 06:45
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fisker commented May 14, 2021

Use generator function instead of return array, should make function more clear

@bmish bmish changed the title prefer-string-starts-ends-with: add suggestions for handling non-existent strings prefer-string-starts-ends-with: add suggestions for safely handling non-strings May 14, 2021
bmish and others added 5 commits May 14, 2021 12:04
* main:
  Temporarily disable `import/extensions` rule
  Update `xo` to v0.40 (sindresorhus#1257)
  Test: Better `output` assertion (sindresorhus#1259)
  `prefer-negative-index`: Refactor (sindresorhus#1255)
  `prefer-dom-node-remove`: Improve parentheses handling (sindresorhus#1254)
  Update `eslint-plugin-eslint-plugin` to v3.0.3 (sindresorhus#1256)
  32.0.1
  `prefer-set-has`: Remove outdated AST types (sindresorhus#1253)
  `prevent-abbreviations`: Fix shorthand import/export detection (sindresorhus#1252)
  32.0.0
  `no-for-loop`: Ignore known non-array loop variables (sindresorhus#1242)
  Add `no-document-cookie` rule (sindresorhus#1244)
  `prefer-array-find`: Singularize variable name in autofix (sindresorhus#1243)
  Update `@babel/core` (sindresorhus#1241)
  Mention libraries used under the hood in `better-regexp` rule doc (sindresorhus#1240)
  `prefer-switch`: Do not add braces to the default case (sindresorhus#1235)
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fisker commented May 15, 2021

The code fix part still need more work , if you don't mind, I can fix it later, unless you prefer do it yourself, I can guide.

Another thing, I think we should remove auto fix for known non-strings, yes auto-fix will throw on runtime, but not every line is test covered, or even not reachable. You need fix this.

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bmish commented May 15, 2021

@fisker I opened a separate PR for ignore known non-strings: #1281 I think we should merge that first since that can be done independently of this suggestion PR.

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bmish commented May 15, 2021

@fisker feel free to push tweaks if you want. I will keep working on it too, appreciate your guidance!

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fisker commented May 17, 2021

I pushed some changes, this corrects the fix logic, this add missing parens when the target is ternary (a ? b : c ?? '').startsWith -> ((a ? b : c) ?? '').startsWith, see #1277 (comment).

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fisker commented May 18, 2021

@bmish Can you fix conflicts?

@fisker fisker marked this pull request as ready for review May 18, 2021 07:16
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fisker commented May 18, 2021

Removed suggestions for known string.

Updated message, I'm not good at English, but I think it's more useful.

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The code looks good, few other comments.

Thanks @bmish

// Goal: `String(target).startsWith(pattern)`
case FIX_TYPE_STRING_CASTING:
// `target` was a call argument, don't need check parentheses
targetText = `String(${targetText})`;
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@bmish bmish May 18, 2021

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This adds extra parenthesis that aren't needed sometimes. I think I had code to handle this before.

in: (/^b/).test((a))
out: ((a)).startsWith('b')

Not a big deal though.

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I know that, but better "add missing parens" instead of "remove extra parens".

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bmish commented May 18, 2021

@fisker looks good, thanks for helping to finish it up.

@sindresorhus sindresorhus merged commit f14a9d1 into sindresorhus:main May 18, 2021
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prefer-string-starts-ends-with: incorrect autofix when string does not exist
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