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To give a proposed PFA/PFB implementation in OpenType.js a useful review, make its scope, format handling, tests, and relationship to the project’s existing parser architecture easy to verify. That can improve the quality of review, but it cannot guarantee approval or a merge. OpenType.js documents support for OpenType fonts and CFF outlines; that does not establish support for standalone PostScript Type 1 files.
First clarify what “Type 1 support” means
OpenType.js describes itself as a JavaScript library for reading and writing OpenType fonts. Its README lists WOFF, OTF, and TTF support, including TrueType glyf and PostScript cff outlines. Those are not the same as loading standalone PostScript Type 1 fonts in PFA or PFB form. Support for CFF outlines inside an OpenType font should not be presented as proof that PFA/PFB files can be parsed.
The distinction came up in historical discussion in OpenType.js issue #643, which asked about parsing incomplete fonts and Type 1 support. A maintainer noted that CFF Type 1 could load through existing CFF support, while standalone PostScript fonts raised a separate scope question. The discussion also floated extensible parsing through plugins as a possible direction; it is historical context, not a statement of current project policy.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsCheck the pull request before describing its status
A social search result points to pull request #871, and a contributor-authored DEV article describes a PFA/PFB support proposal. The official pull request page and its current diff, reviews, checks, and decision were not verifiable from the available sources. Treat its status and implementation quality as unknown unless you confirm them directly on GitHub. Do not imply that it is open, approved, blocked, or merged based only on the secondary references.
#1 Best Overall
Make the proposal easy to evaluate
OpenType.js documents a contribution path: fork and clone the repository, install dependencies, make changes, and open a pull request. Its README also describes development, build, and test commands. Follow the current repository instructions, but treat them as process guidance—not a promise of review speed or acceptance.
In the pull request description, answer the concrete questions reviewers need to assess:
- Scope: Identify which standalone Type 1 variants and PFA/PFB inputs are intended to work, and list exclusions.
- Detection: Explain how the parser distinguishes these files from the OpenType formats the library already handles.
- Representation: Show how parsed font data and glyphs map into OpenType.js structures.
- Failure behavior: Specify what happens with unsupported features, malformed input, and truncated files; state whether the parser returns a clear error or intentionally skips a case.
- Architecture: Give a short overview and point reviewers to the entry points for detection, parsing, glyph conversion, and tests. If the change is large, explain how it fits the existing parsing architecture.
- Provenance: Identify borrowed code and its license and origin.
Ask maintainers directly whether standalone Type 1 belongs in the library’s scope or whether an extension point would be more appropriate. That question follows from the distinction raised in issue #643; it should not be treated as already settled.
Use tests that expose PFA/PFB-specific risks
FreeType’s Type 1 parser is a useful technical reference for the kinds of edge cases a reviewer may want to see handled. Its source checks PFB segment tags and sizes, handles PFA as text, locates the eexec marker, and reads private-dictionary data. These details identify useful test areas; they do not demonstrate that any proposed JavaScript implementation handles them correctly.
Rank #3
- Used Book in Good Condition
Include small, reproducible fixtures and organize tests around observable behavior:
| Input or behavior | What a reviewer should be able to verify |
|---|---|
| Valid PFA | The parser recognizes the intended text-form input and processes the relevant eexec data. |
| Valid PFB | Segment tags, declared sizes, and segment boundaries are handled as intended. |
| Truncated or malformed input | The parser fails predictably, with a clear error or another explicitly documented behavior. |
| Supported and unsupported features | Tests show the boundary of the implementation rather than implying complete Type 1 coverage. |
| Output conversion | Parsed font and glyph data map into the library’s representation in a reproducible way. |
Keep each fixture minimal enough that a failure points to a specific behavior. State how to run the tests using the repository’s current documented command, and report results only after actually running them.
Rank #4
What can—and cannot—improve merge chances
A clear scope, focused tests, understandable architecture, and explicit error behavior make it easier for maintainers to assess a proposal. They can support a more productive review; they cannot ensure that maintainers agree the feature belongs in the project, that the implementation meets its standards, or that the pull request will be merged. The available sources do not establish the present status or quality of PR #871, so no outcome prediction is justified.
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