typescript compile error

[aminlatifi]

Ethers Version

5.7.2

Search Terms

typescript type compile error

Describe the Problem

Typescript compile error on
"typescript": "^4.9.3",

node_modules/@ethersproject/abstract-provider/src.ts/index.ts:251:13 - error TS2322: Type 'BigNumber' is not assignable to type 'null'.

251             lastBaseFeePerGas = block.baseFeePerGas;
                ~~~~~~~~~~~~~~~~~

node_modules/@ethersproject/abstract-provider/src.ts/index.ts:252:13 - error TS2322: Type 'BigNumber' is not assignable to type 'null'.

252             maxPriorityFeePerGas = BigNumber.from("1500000000");
                ~~~~~~~~~~~~~~~~~~~~

node_modules/@ethersproject/abstract-provider/src.ts/index.ts:253:13 - error TS2322: Type 'BigNumber' is not assignable to type 'null'.

253             maxFeePerGas = block.baseFeePerGas.mul(2).add(maxPriorityFeePerGas);
                ~~~~~~~~~~~~

node_modules/@ethersproject/abstract-provider/src.ts/index.ts:253:59 - error TS2345: Argument of type 'null' is not assignable to parameter of type 'BigNumberish'.

253             maxFeePerGas = block.baseFeePerGas.mul(2).add(maxPriorityFeePerGas);
                                                              ~~~~~~~~~~~~~~~~~~~~

Code Snippet

No response

Contract ABI

No response

Errors

No response

Environment

node.js (v12 or newer)

Environment (Other)

No response

[ricmoo]

In v5, strictNullCheck is not enabled, so null is always implied.

You should ensure your build is not checking libraries against your own tsconfig, to get rid of this error (there is a tsconfig entry you enabled that is likely causing this, or you are not including node_modules in your search path).

In v6, the library uses strictNullChecks, so this is no longer a problem. :)

[aminlatifi]

Thanks @ricmoo, I have excluded node_modules in tsconfig

  "exclude": ["./node_modules/*", "./build"],

but as far ethers is imported somewhere typescript compiler throws error. I solved with by the help of @ts-ignore and package-patch so far.