elastio/bon

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Next-gen compile-time-checked builder generator, named function's arguments, and more!

Stars: 2.1k
Forks: 46
Open beginner issues: 0
Indexed issues: 28
Avg merge: 53m
Merged PRs (30d): 5

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 7, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

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28 open issues indexed

Build trait for optionally abstracting generated builders Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

elastio/bon#401 · 6 comments · Opened Aug 31, 2026
Add a flag to make the builder setter signatures take &mut Self and return &mut Self Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

elastio/bon#397 · 4 comments · Opened Aug 24, 2026
[Feature] Add an `as_ref` conversion Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 38/100

elastio/bon#355 · 2 comments · Opened Nov 11, 2025
Reinterpret generic type Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

elastio/bon#328 · 2 comments · Opened Aug 11, 2025
Feature Request: method to fill the remaining values from an instance of existing built object Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

elastio/bon#310 · 7 comments · 1 reaction · Opened Jun 26, 2025
feat(debug): dump attribute which is local expand (see example) Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

elastio/bon#308 · 1 comment · Opened Jun 25, 2025
`#[builder]` with higher-rank trait bounds can cause confusing errors Open

design needed papercut

Difficulty 4/5 3-5 days Newbie friendliness 35/100

elastio/bon#307 · 3 comments · Opened Jun 20, 2025
support for default value for optional argument without custom setting Open

waiting on author

Difficulty 3/5 1-2 days Newbie friendliness 42/100

elastio/bon#305 · 3 comments · 1 reaction · Opened Jun 16, 2025
Support flattened builders Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

elastio/bon#274 · 3 comments · 11 reactions · Opened Apr 9, 2025
Support prefix overrides at the top level with `#[builder(on(...))]` Open

feature request waiting on author

Difficulty 5/5 Over a week Newbie friendliness 30/100

elastio/bon#230 · 4 comments · 1 reaction · Opened Dec 6, 2024
`#[builder(getter)]` full batteries mode Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

elastio/bon#225 · 15 comments · 7 reactions · Opened Dec 1, 2024
Support grouping all builder types under a separate module Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#214 · 3 reactions · Opened Nov 22, 2024
Support special setters for collections Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 15/100

elastio/bon#190 · 6 comments · 3 reactions · Opened Nov 10, 2024
Take advantage of associated type defaults once they hit stable Rust Open

blocked enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#188 · 7 reactions · Opened Nov 10, 2024
Preserve original formatting when rending default expressions in docs with `Span::source_text` Open

blocked feature request

Difficulty 3/5 1-2 days Newbie friendliness 35/100

elastio/bon#187 · 1 comment · Opened Nov 9, 2024
Support concrete default for generic/`impl Trait` argument. Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

elastio/bon#168 · 10 comments · 7 reactions · Opened Oct 29, 2024
Support non-flag attributes in `#[builder(on(...))]` Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

elastio/bon#152 · 1 reaction · Opened Oct 20, 2024
Stabilize `#[builder(overwritable)]` Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

elastio/bon#149 · 38 comments · 18 reactions · Opened Oct 3, 2024
Introduce `#[derive(Setters, Getters)]` to derive simple accessor methods Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#147 · 2 comments · 12 reactions · Opened Sep 21, 2024
Introduce `#[derive(New)]` for deriving the `new()` method Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

elastio/bon#146 · 4 reactions · Opened Sep 21, 2024
Support shared `#[builder]` configuration in `#[bon]` macro at the `impl` block level Open

feature request

Difficulty 4/5 3-5 days Newbie friendliness 35/100

elastio/bon#144 · 4 reactions · Opened Sep 18, 2024
Introduce bool shorthand (`#[builder(flag)]`) Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 35/100

elastio/bon#142 · 15 comments · 12 reactions · Opened Sep 17, 2024
Support grouping several members as positional arguments to a single setter Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#141 · 6 comments · 3 reactions · Opened Sep 17, 2024
Introduce `derive(Projection)` to generate a type with the subset of the fields from the original Open

design needed feature request

elastio/bon#130 · 2 comments · 1 reaction · 1 assignee · Opened Sep 13, 2024
Introduce the syntax where builder is passed via a closure Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#127 · 8 comments · 2 reactions · Opened Sep 11, 2024
Support generating builders from traits and trait impls Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 20/100

elastio/bon#123 · 4 comments · 13 reactions · Opened Sep 10, 2024
Support member groups: mutually exclusive, mutually required members Open

design needed feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#110 · 15 comments · 8 reactions · Opened Sep 8, 2024
Use Rust Analyzer API to generate robust completions Open

feature request

Difficulty 5/5 Over a week Newbie friendliness 25/100

elastio/bon#71 · 2 reactions · Opened Aug 28, 2024

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