Format docstrings with the new format tools command #7623

zth · 2025-07-10T08:18:34Z

This runs the new tools format-codeblocks command on the stdlib and formats all docstrings that can be formatted directly without any modification. It does the following:

Formats all ReScript code blocks in docstrings
Transforms assertEqual() to ==

There are a bunch of them that cannot be formatted as of now because of:

Syntax errors (| whatever => ... where ... of course won't parse)
Uses pipe last |> which now is a syntax error

We need to resolve both of these if we want to be able to check formatting in CI, and make it a part of make format (which we should).

For 1) we'll just fix them. Let's do that in a separate PR.
For 2) my personal opinion is we just remove the offending examples/docstrings if it doesn't make sense to convert them to the regular pipe. This goes for the old Js.Array etc modules, which are ancient at this point.

Thoughts?

zth · 2025-07-10T08:19:54Z

runtime/Stdlib_Float.resi

@@ -37,7 +37,7 @@ Float constants.
 module Constants: {
  /**
  The special value "Not a Number"
-  See [`NaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN) on MDN.
+See [`NaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN) on MDN.


Not sure why this whitespace is removed.

that looks like a bug of the formatter when there's some indentation and the line is too long I guess?

Yeah. This has to be Cmarkit that does that formatting. Probably something we'll need to live with, but will investigate.

runtime/Stdlib_JSON.resi

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tsnobip · 2025-07-10T08:27:27Z

Great work @zth!

For 2) my personal opinion is we just remove the offending examples/docstrings if it doesn't make sense to convert them to the regular pipe. This goes for the old Js.Array etc modules, which are ancient at this point.

I agree with you, these APIs use t-last (hence the use of pipe-last), I'm not sure it's worth documenting them anymore, they're very inconvenient to use now!

zth · 2025-07-10T08:35:23Z

Changing to draft, but please do go through it and review.

tsnobip

great work! That was the last remaining part to have synced formatted and tested documentation!

tsnobip · 2025-07-10T08:29:50Z

runtime/Stdlib_Float.resi

@@ -37,7 +37,7 @@ Float constants.
 module Constants: {
  /**
  The special value "Not a Number"
-  See [`NaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN) on MDN.
+See [`NaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN) on MDN.


that looks like a bug of the formatter when there's some indentation and the line is too long I guess?

zth · 2025-07-10T08:50:28Z

Going to take the opportunity to provide a proper extraction command in tools for pulling out all code blocks, and for transforming == back to assertEqual, so we can power the DocTests with that.

We're getting some syntax error from extraction here so it feels better to do that so we have proper AST driven extraction rather than the current JS based one we have now, that can be a bit fragile (as shows).

pkg-pr-new · 2025-07-11T07:08:22Z

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commit: f8a5a71

zth · 2025-07-11T13:02:01Z

@cristianoc could you take another look at the changes I made to support proper code block extraction via tools?

@aspeddro could you review the changes I made to DocTests.res, to use the new code block extractor?

zth · 2025-07-11T13:03:57Z

runtime/Belt.res

+let mySet1: t<(int, int), Comparable1.identity> = %todo
+let mySet2: t<(int, int), Comparable2.identity> = %todo


Did this so it could be parsed/compiled.

zth · 2025-07-11T13:04:17Z

runtime/Belt_Array.resi

@@ -24,7 +24,7 @@ Return the size of the array
 ## Examples

 ```rescript
-assertEqual(Belt.Array.length(["test"]), 1)
+Belt.Array.length(["test"]) == 1


All assertEqual are now ==.

zth · 2025-07-11T13:07:16Z

runtime/Js_array.res

-
-Here is an example to find the sum of squares of all even numbers in an array.
-Without pipe last, we must call the functions in reverse order:
-
-## Examples
-
-```rescript
-let isEven = x => mod(x, 2) == 0
-let square = x => x * x
-let result = {
-  open Js.Array
-  reduce(\"+", 0, map(square, filter(isEven, [5, 2, 3, 4, 1])))
-}
-```
-
-With pipe last, we call the functions in the “natural” order:
-
-```rescript
-let isEven = x => mod(x, 2) == 0
-let square = x => x * x
-let result = {
-  open Js.Array
-  [5, 2, 3, 4, 1] |> filter(isEven) |> map(square) |> reduce("+", 0)
-}
-```


Just went ahead and removed these since the API is ancient and |> is a parse error in v12.

cknitt

Great stuff! 🎉

CHANGELOG.md

cknitt · 2025-07-11T14:54:55Z

runtime/Js_float.res

@@ -68,7 +68,7 @@ external isFinite: float => bool = "isFinite"
 /**
 Formats a `float` using exponential (scientific) notation. Return a
 `string` representing the given value in exponential notation. Raise
-RangeError if digits is not in the range [0, 20] (inclusive). See [`toExponential`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toExponential) on MDN.
+RangeError if digits is not in the range \[0, 20\] (inclusive). See [`toExponential`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toExponential) on MDN.


Why are we getting these backslashes now?

Must be something Cmarkit does. I'll have a look.

So while this seems unnecessary, it's done by Cmarkit (the lib we use to render) and doesn't hurt rendering in the editor. So, I think we can leave this as is, and if Cmarkit improves (escapes less) it'll be handled automatically by a reformat.

I guess that's to make it less likely to be incorrectly interpreted as links.

cknitt · 2025-07-11T14:55:29Z

runtime/Js_math.res

@@ -164,7 +164,7 @@ external atanh: float => float = "atanh"

 /**
 Returns the angle (in radians) of the quotient `y /. x`. It is also the angle
-between the *x*-axis and point (*x*, *y*). See
+between the *x*\-axis and point (*x*, *y*). See


Same here, something is escaped too much

…ead, since we need more info for each block than we do for formatting

zth requested review from tsnobip, cknitt and fhammerschmidt July 10, 2025 08:18

zth commented Jul 10, 2025

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zth marked this pull request as draft July 10, 2025 08:35

tsnobip approved these changes Jul 10, 2025

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fhammerschmidt approved these changes Jul 10, 2025

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zth force-pushed the format-stdlib-docstrings branch from da72a1b to 5b8ca47 Compare July 11, 2025 13:01

zth commented Jul 11, 2025

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zth marked this pull request as ready for review July 11, 2025 13:11

zth requested a review from cristianoc July 11, 2025 13:17

cknitt reviewed Jul 11, 2025

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zth added 6 commits July 11, 2025 19:59

format docstrings with the new format tools command

4459254

handle piped assertEqual

7633422

compiled files

f52f6d5

add extraction command for code blocks

8c9e810

change transform to only work on structure items

2f283ce

refactor

6df0c01

zth added 10 commits July 11, 2025 19:59

change code block extraction approach to use the typed artifacts inst…

d1e1256

…ead, since we need more info for each block than we do for formatting

add ExtractCodeBlocks to RescriptTools for simplicity

0aae7d7

integrate code block extraction into doctests script

77bf1a5

only include code blocks with tests in them

699b892

update analysis examples

cba8253

fix last remaining format issues in runtime docstrings

c7eab25

update analysis test files

2cc3a22

more test output

242dfa6

changelog

4a971c0

fix changelog

f8a5a71

zth force-pushed the format-stdlib-docstrings branch from 7fe406b to f8a5a71 Compare July 11, 2025 17:59

		let mySet1: t<(int, int), Comparable1.identity> = %todo
		let mySet2: t<(int, int), Comparable2.identity> = %todo

Format docstrings with the new format tools command #7623

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Format docstrings with the new format tools command #7623

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zth commented Jul 10, 2025

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tsnobip commented Jul 10, 2025

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zth commented Jul 10, 2025

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