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krofax
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📝 WalkthroughWalkthroughThe changes update both a documentation tutorial and a Solidity contract. In the tutorial file, links and text are revised: the referenced version of the Sequence Diagram(s)sequenceDiagram
participant User
participant MyCustomL2Token as Contract
User->>MyCustomL2Token: Call mint(_to, _amount)
Note right of MyCustomL2Token: Validates against IOptimismMintableERC20 & ILegacyMintableERC20
MyCustomL2Token-->>User: Successfully mints tokens
sequenceDiagram
participant User
participant MyCustomL2Token as Contract
User->>MyCustomL2Token: Call burn(_from, _amount)
Note right of MyCustomL2Token: burn function immediately reverts to block L1 withdrawals
MyCustomL2Token-->>User: Error response (revert)
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🧹 Nitpick comments (3)
pages/app-developers/tutorials/bridging/standard-bridge-custom-token.mdx (2)
31-31: Avoid using bold for emphasis.Guidelines suggest limiting the use of bold for emphasis. Consider removing bold formatting to remain consistent with the style guide.
- The Standard Bridge **does not** support [**fee on transfer tokens**] or [**rebasing tokens**]... + The Standard Bridge does not support [fee on transfer tokens] or [rebasing tokens]...
85-85: Add a missing comma for clarity.A comma after "like" clarifies the sentence.
- You can name this file whatever you'd like, for example `MyCustomL2Token.sol`. + You can name this file whatever you'd like, for example, `MyCustomL2Token.sol`.🧰 Tools
🪛 LanguageTool
[uncategorized] ~85-~85: Possible missing comma found.
Context: ...name this file whatever you'd like, for exampleMyCustomL2Token.sol. {Copy the...
(AI_HYDRA_LEO_MISSING_COMMA)
public/tutorials/standard-bridge-custom-token.sol (1)
136-156: Unreachable code note.The
burnfunction reverts to prevent L1 withdrawals. The commented-out_burncall is unreachable. Consider removing it or clarifying with a code comment if it is only for example purposes.149-156 - revert("MyCustomL2Token: withdrawals are not allowed"); - - // Note: The following line would normally execute but is unreachable - // _burn(_from, _amount); - // emit Burn(_from, _amount); + revert("MyCustomL2Token: withdrawals are not allowed");
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`**/*.mdx`: "ALWAYS review Markdown content THOROUGHLY with the following criteria: - First, check the frontmatter section at the top of the file: 1. For regular pages, ensure AL...
**/*.mdx: "ALWAYS review Markdown content THOROUGHLY with the following criteria:
- First, check the frontmatter section at the top of the file:
- For regular pages, ensure ALL these fields are present and not empty:
--- title: [non-empty] lang: [non-empty] description: [non-empty] topic: [non-empty] personas: [non-empty array] categories: [non-empty array] content_type: [valid type] ---
- For landing pages (index.mdx or files with ), only these fields are required:
--- title: [non-empty] lang: [non-empty] description: [non-empty] topic: [non-empty] ---
- If any required fields are missing or empty, comment:
'This file appears to be missing required metadata. You can fix this by running:Review the changes, then run without :dry to apply them.'pnpm metadata-batch-cli:dry "path/to/this/file.mdx"- Use proper nouns in place of personal pronouns like 'We' and 'Our' to maintain consistency in communal documentation.
- Avoid gender-specific language and use the imperative form.
- Monitor capitalization for emphasis. Avoid using all caps, italics, or bold for emphasis.
- Ensure proper nouns are capitalized in sentences.
- Apply the Oxford comma.
- Use proper title case for buttons, tab names, page names, and links. Sentence case should be used for body content and short phrases, even in links.
- Use correct spelling and grammar at all times (IMPORTANT).
- For H1, H2, and H3 headers:
- Use sentence case, capitalizing only the first word.
- Preserve the capitalization of proper nouns, technical terms, and acronyms as defined in the 'nouns.txt' file located in the root directory of the project.
- Do not automatically lowercase words that appear in the 'nouns.txt' file, regardless of their position in the header.
- Flag any headers that seem to inconsistently apply these rules for manual review.
- When reviewing capitalization, always refer to the 'nouns.txt' file for the correct capitalization of proper nouns and technical terms specific to the project.
"
pages/app-developers/tutorials/bridging/standard-bridge-custom-token.mdx
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pages/app-developers/tutorials/bridging/standard-bridge-custom-token.mdx
[uncategorized] ~85-~85: Possible missing comma found.
Context: ...name this file whatever you'd like, for example MyCustomL2Token.sol. {
Copy the...
(AI_HYDRA_LEO_MISSING_COMMA)
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🔇 Additional comments (9)
pages/app-developers/tutorials/bridging/standard-bridge-custom-token.mdx (3)
23-23: Looks great.The added introduction line correctly clarifies the purpose of the tutorial.
26-26: Good reference update.Using the upgraded
IOptimismMintableERC20interface version (v1.12.2) is consistent with the latest Optimism contracts.
52-53: Faucet references look correct.Providing the Sepolia faucet link and the Superchain Faucet link is helpful.
public/tutorials/standard-bridge-custom-token.sol (6)
2-2: Solidity version update.Adopting
pragma solidity 0.8.15;aligns with the recommended compiler version for current Optimism contracts.
8-19: New legacy interface definition.The
ILegacyMintableERC20interface is well-defined and neatly namespaced, preserving backward compatibility.
20-29: Additional interface.
IOptimismMintableERC20clarifies bridge-critical methods and keeps the contract consistent with Optimism’s requirements.
31-73: Semver contract.The
Semvercontract is a neat approach for versioning. Implementation is straightforward, and the helper function is clearly limited in scope.
80-80: Multiple inheritance setup.Combining
IOptimismMintableERC20,ILegacyMintableERC20,ERC20, andSemverinto a single contract is well-executed.
158-168: Interface support check.Verifying
supportsInterfaceforIERC165,ILegacyMintableERC20, andIOptimismMintableERC20is correct.
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🧹 Nitpick comments (2)
public/tutorials/standard-bridge-custom-token.sol (2)
31-73: Consider using OpenZeppelin's Strings library for the Semver implementation.The custom
toStringimplementation works for this tutorial, but in production code, it would be better to leverage OpenZeppelin's battle-testedStringslibrary for numeric conversion.// Import the Strings library +import { Strings } from "@openzeppelin/contracts/utils/Strings.sol"; contract Semver { string public version; - // Simple function to convert uint to string for version numbers - function toString(uint256 value) internal pure returns (string memory) { - // This function handles numbers from 0 to 999 which is sufficient for versioning - if (value == 0) { - return "0"; - } - - uint256 temp = value; - uint256 digits; - - while (temp != 0) { - digits++; - temp /= 10; - } - - bytes memory buffer = new bytes(digits); - - while (value != 0) { - digits -= 1; - buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); - value /= 10; - } - - return string(buffer); - } constructor(uint256 major, uint256 minor, uint256 patch) { version = string(abi.encodePacked( - toString(major), + Strings.toString(major), ".", - toString(minor), + Strings.toString(minor), ".", - toString(patch) + Strings.toString(patch) )); } }
158-168: Improve the supportsInterface implementation.The current implementation doesn't follow ERC-165 best practices. Typically, supportsInterface should also check if the parent contract supports the interface.
- function supportsInterface(bytes4 _interfaceId) external pure virtual returns (bool) { + function supportsInterface(bytes4 _interfaceId) external view virtual returns (bool) { bytes4 iface1 = type(IERC165).interfaceId; // Interface corresponding to the legacy L2StandardERC20 bytes4 iface2 = type(ILegacyMintableERC20).interfaceId; // Interface corresponding to the updated OptimismMintableERC20 bytes4 iface3 = type(IOptimismMintableERC20).interfaceId; return _interfaceId == iface1 || _interfaceId == iface2 || _interfaceId == iface3; }Also, note that this function should be
viewinstead ofpureas it's not modifying state but still accesses contract data.
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🔇 Additional comments (7)
public/tutorials/standard-bridge-custom-token.sol (7)
2-2: Solidity version correctly updated.The change from
^0.8.0to0.8.20is appropriate and matches the recommendation from previous reviews to align with OpenZeppelin dependencies.
8-29: Well-structured interface definitions that improve compatibility.The addition of both
ILegacyMintableERC20andIOptimismMintableERC20interfaces provides clear separation between legacy support and current implementation. This dual-interface approach enables backward compatibility while moving toward more descriptive naming conventions in the newer interface.
80-80: Good implementation of multiple interfaces.The contract now properly implements both the legacy and current interfaces, which ensures compatibility with existing systems while also supporting the newer interface design.
114-114: Semver initialization added correctly.Adding semantic versioning to the token contract is a good practice that will help track contract versions in production.
129-130: Function correctly overrides both interface implementations.The
mintfunction properly overrides both interfaces, maintaining compatibility.
136-156: Intentional revert behavior for burn function is well-documented.The modification to make the
burnfunction always revert is clearly documented and implements the stated goal of preventing withdrawals to L1. The commented-out code helps explain what would normally happen in a standard implementation.
170-188: Well-implemented backward compatibility.Adding legacy getter functions alongside the new interface functions ensures backward compatibility with existing systems. The clear documentation indicating these are legacy functions is also helpful.
ZakAyesh
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ZakAyesh
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LGTM! I'll make a note we should probably not be sending them to a different tutorial at the end of this one, and rather have all the info within this tutorial. We can save that for a future update however.
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