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feat(compiler-sfc): add preserveTilde option for asset URL and srcset transformations #13462

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@edison1105 edison1105 commented Jun 11, 2025

close #13460
close vitejs/vite-plugin-vue#15

This PR introduces a new option, preserveTilde, for handling the ~ in asset URLs.

  • The default value is false, which keeps the existing behavior: leading ~ and ~/ are stripped - it's exactly the same as before.
  • If set to true, leading ~ and ~/ are preserved and resolution relies on the bundler (e.g., Vite).

Usage example:

  // vite.config.js
  plugins: [vue({
    template:{
      transformAssetUrls:{
        preserveTilde: true 
      }
    }
  })],

Summary by CodeRabbit

  • New Features
    • Added support for preserving the tilde (~) character in asset URLs and srcset attributes when specified, improving compatibility with certain aliasing setups.
  • Tests
    • Introduced new test cases to verify the behavior of asset URL and srcset transformations when the preserveTilde option is enabled.

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coderabbitai bot commented Jun 11, 2025

Walkthrough

A new preserveTilde option was introduced to asset URL transformation logic, allowing tilde (~) prefixes in URLs to be preserved when specified. The parseUrl, transformAssetUrl, and transformSrcset functions were updated to support this option. Corresponding tests were added to verify the behavior with preserveTilde: true.

Changes

Files/Groups Change Summary
templateTransformAssetUrl.spec.ts, templateTransformSrcset.spec.ts Added tests for asset URL/srcset transformation with preserveTilde: true option.
templateUtils.ts Updated parseUrl function to accept and respect preserveTilde parameter.
transformAssetUrl.ts Added preserveTilde to AssetURLOptions, set default, and passed to parseUrl calls.
transformSrcset.ts Passed options.preserveTilde to parseUrl in transformSrcset function.

Sequence Diagram(s)

sequenceDiagram
    participant TemplateCompiler
    participant TransformAssetUrl
    participant TransformSrcset
    participant ParseUrl

    TemplateCompiler->>TransformAssetUrl: compile(template, { preserveTilde })
    TransformAssetUrl->>ParseUrl: parseUrl(url, preserveTilde)
    ParseUrl-->>TransformAssetUrl: returns parsed URL (tilde preserved if option true)
    TransformAssetUrl-->>TemplateCompiler: transformed asset URL

    TemplateCompiler->>TransformSrcset: compileSrcset(template, { preserveTilde })
    TransformSrcset->>ParseUrl: parseUrl(srcsetUrl, preserveTilde)
    ParseUrl-->>TransformSrcset: returns parsed srcset URL (tilde preserved if option true)
    TransformSrcset-->>TemplateCompiler: transformed srcset
Loading

Assessment against linked issues

Objective Addressed Explanation
Allow preservation of leading ~ in asset URLs when preserveTilde is true (#13460)
Add tests to verify preserveTilde behavior in asset URL and srcset transformations (#13460)

Assessment against linked issues: Out-of-scope changes

(No out-of-scope changes found.)

Poem

A tilde once lost, now found in the code,
For Nuxt and its friends, a much lighter load.
With options anew, URLs can be free,
To keep their squiggle as proud as can be!
🐇✨

~ The CodeRabbit

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Size Report

Bundles

File Size Gzip Brotli
runtime-dom.global.prod.js 101 kB 38.4 kB 34.6 kB
vue.global.prod.js 159 kB 58.5 kB 52.2 kB

Usages

Name Size Gzip Brotli
createApp (CAPI only) 46.7 kB 18.2 kB 16.7 kB
createApp 54.6 kB 21.3 kB 19.4 kB
createSSRApp 58.9 kB 23 kB 21 kB
defineCustomElement 59.6 kB 22.9 kB 20.9 kB
overall 68.7 kB 26.4 kB 24.1 kB

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commit: b896fd4

@edison1105 edison1105 changed the base branch from main to minor June 11, 2025 01:04
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Actionable comments posted: 0

🧹 Nitpick comments (4)
packages/compiler-sfc/src/template/templateUtils.ts (1)

22-31: preserveTilde flag integrates cleanly – consider future-proofing with WHATWG URL

The early-return logic is solid and preserves existing behaviour when the flag is falsy ✅.
However, url.parse (the legacy API behind uriParse) is deprecated in recent Node versions; the WHATWG URL constructor is now the recommended API. Migrating at some point would avoid deprecation warnings and give stricter parsing.

No action required for this PR, but adding a tech-debt ticket now will save churn later.

packages/compiler-sfc/src/template/transformAssetUrl.ts (1)

123-129: Redundant parse on options.base

parseUrl is executed twice in the same branch – once for attr.value.content and again for options.base. The second invocation is unavoidable, but you could memoise it locally to avoid reparsing base for every attribute.

-const base = parseUrl(options.base, options.preserveTilde)
+const baseUrl = parseUrl(options.base, options.preserveTilde)

Minor perf win, feel free to ignore.

packages/compiler-sfc/__tests__/templateTransformAssetUrl.spec.ts (1)

103-111: 👍 Test covers both ~/ and ~ alias forms

Snapshot ensures both syntaxes compile. Consider asserting the generated import path explicitly (e.g. contains import _imports_0 from '~/app/bar.png') to make the test more intention-revealing.

packages/compiler-sfc/__tests__/templateTransformSrcset.spec.ts (1)

102-111: Good parity with asset-url tests

Mirrors the asset-url testcase; same note about being explicit applies here.

📜 Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between cdffaf6 and b896fd4.

⛔ Files ignored due to path filters (2)
  • packages/compiler-sfc/__tests__/__snapshots__/templateTransformAssetUrl.spec.ts.snap is excluded by !**/*.snap
  • packages/compiler-sfc/__tests__/__snapshots__/templateTransformSrcset.spec.ts.snap is excluded by !**/*.snap
📒 Files selected for processing (5)
  • packages/compiler-sfc/__tests__/templateTransformAssetUrl.spec.ts (1 hunks)
  • packages/compiler-sfc/__tests__/templateTransformSrcset.spec.ts (1 hunks)
  • packages/compiler-sfc/src/template/templateUtils.ts (1 hunks)
  • packages/compiler-sfc/src/template/transformAssetUrl.ts (2 hunks)
  • packages/compiler-sfc/src/template/transformSrcset.ts (1 hunks)
🧰 Additional context used
🧬 Code Graph Analysis (2)
packages/compiler-sfc/src/template/transformSrcset.ts (1)
packages/compiler-sfc/src/template/templateUtils.ts (1)
  • parseUrl (22-32)
packages/compiler-sfc/src/template/transformAssetUrl.ts (1)
packages/compiler-sfc/src/template/templateUtils.ts (1)
  • parseUrl (22-32)
⏰ Context from checks skipped due to timeout of 90000ms (4)
  • GitHub Check: Redirect rules
  • GitHub Check: Header rules
  • GitHub Check: Pages changed
  • GitHub Check: test / unit-test-windows
🔇 Additional comments (3)
packages/compiler-sfc/src/template/transformAssetUrl.ts (2)

35-41: Option contract extended correctly – please bubble the docs

preserveTilde is added with a clear JSDoc and default. Looks good.
Remember to surface the new option in user-facing docs / typings packages (@vue/compiler-sfc).


46-47: Default updated – snapshot tests already cover it

No issues spotted.

packages/compiler-sfc/src/template/transformSrcset.ts (1)

111-112: preserveTilde correctly forwarded

Passing options.preserveTilde keeps behaviour consistent with transformAssetUrl. Good catch.

@edison1105 edison1105 changed the base branch from minor to main June 11, 2025 01:20
@danielroe
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this looks great! thank you ❤️

is it still possible to import from modules, ie some-npm-package/file.png?

(I would imagine that would just be up to the bundler to resolve, and would therefore work with vite.)

@edison1105
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You're absolutely right!
This PR only affects handling for ~ prefixes:

With preserveTilde set to false, everything works as before.
With preserveTilde set to true, the ~ is preserved and resolution is handled by the bundler (like Vite).

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Successfully merging this pull request may close these issues.

Allow ~/path as <img src="~/..."> with ~ alias tilde alias not working in img.src
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