Support EIP-712 cheatcodes in Solidity Test#260
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Pull request overview
Adds documentation for newly supported EIP-712 hashing cheatcodes in Hardhat Solidity tests, including the required test.solidity.eip712Types configuration and a dedicated guide for collecting/using EIP-712 struct types.
Changes:
- Document new
test.solidity.eip712Typesconfiguration and link it to the relevant cheatcodes and guide. - Add new cheatcode reference pages for
eip712HashType,eip712HashStruct, andeip712HashTypedData, plus a new “EIP-712 type hashing” testing guide. - Remove EIP-712 items from the “unsupported cheatcodes” list and bump
@nomicfoundation/hardhat-errors(and lockfile updates).
Reviewed changes
Copilot reviewed 7 out of 8 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| src/content/docs/docs/reference/configuration.mdx | Documents the new test.solidity.eip712Types config block and links to cheatcodes/guide. |
| src/content/docs/docs/reference/cheatcodes/Utilities/eip712-hash-typed-data.mdx | Adds reference docs for hashing full EIP-712 typed-data JSON payloads. |
| src/content/docs/docs/reference/cheatcodes/Utilities/eip712-hash-type.mdx | Adds reference docs for hashing canonical EIP-712 type strings (by name or definition). |
| src/content/docs/docs/reference/cheatcodes/Utilities/eip712-hash-struct.mdx | Adds reference docs for hashing EIP-712 structs by registered type name + ABI-encoded value. |
| src/content/docs/docs/reference/cheatcodes/unsupported-cheatcodes.mdx | Removes EIP-712 cheatcodes from the “unsupported” list. |
| src/content/docs/docs/guides/testing/eip712-types.mdx | Adds a new guide explaining configuration and usage patterns for EIP-712 hashing in Solidity tests. |
| package.json | Bumps @nomicfoundation/hardhat-errors dependency. |
| pnpm-lock.yaml | Updates lockfile for the dependency bump (including transitive updates). |
Files not reviewed (1)
- pnpm-lock.yaml: Language not supported
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| '"Mail":[{"name":"from","type":"Person"},{"name":"to","type":"Person"},{"name":"contents","type":"string"}],' | ||
| '"Person":[{"name":"wallet","type":"address"},{"name":"name","type":"string"}]' | ||
| '},' | ||
| '"primaryType":"Mail",' |
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True, they are not valid, but the idea was to simplify the reading by using shorter fake addresses
ChristopherDedominici
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kanej
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May 20, 2026
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I did a run through manually of the guide. LGTM!
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Docs for Hardhat PR: NomicFoundation/hardhat#8243
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