Importing using wildcard export causes `UNCAUGHT EXCEPTION`

[undermethod]

1. root git dir contains (among others) /src/constants/ dir, itself containing:
   • sampleconst.ts:

     export const STR_HARDCODED = "StrVal";
     

     along with index.ts:

     export * from "sampleconst.ts";
     

2. child dir /subgraph/ contains (among others):
   • package.json
     • "@graphprotocol/graph-cli": "^0.29.0",
     • "@graphprotocol/graph-ts": "^0.26.0",
   • schema, manifest, lock file, locally installed dependencies
   • /src/ (among others) contains:
     • mappings/samplemapping.ts containing

       import { Sample as SampleEvent } from "../../generated/SampleContractName/SampleContract";
       import { SampleEntity } from "../../generated/schema";
       import { STR_HARDCODED } from "../../../src/constants"; // <-- issue is here
       
       export function handleSampleEvent(event: SampleEvent): void {
         const entity = new Entity(event.transaction.hash.toHex());
         entity.role = STR_HARDCODED;
         entity.save();
       }
       

3. performing a codegen succeeds
4. performing a build fails:

   Error: Failed to compile data source mapping: assertion failed
       at Compiler._compileDataSourceMapping (/Users/path/subgraph/node_modules/@graphprotocol/graph-cli/src/compiler/index.js:307:13)
       at /Users/path/subgraph/node_modules/@graphprotocol/graph-cli/src/compiler/index.js:216:20
       at updateInDeepMap (/Users/path/subgraph/node_modules/immutable/dist/immutable.js:1971:22)
       at updateInDeepMap (/Users/path/subgraph/node_modules/immutable/dist/immutable.js:1980:23)
       at updateInDeepMap (/Users/path/subgraph/node_modules/immutable/dist/immutable.js:1980:23)
       at Map.updateIn (/Users/path/subgraph/node_modules/immutable/dist/immutable.js:1278:26)
       at /Users/path/subgraph/node_modules/@graphprotocol/graph-cli/src/compiler/index.js:215:24
       at /Users/path/subgraph/node_modules/immutable/dist/immutable.js:3016:46
       at List.__iterate (/Users/path/subgraph/node_modules/immutable/dist/immutable.js:2206:13)
       at IndexedIterable.mappedSequence.__iterateUncached (/Users/path/subgraph/node_modules/immutable/dist/immutable.js:3015:23)
   UNCAUGHT EXCEPTION: Error: The AssemblyScript compiler crashed when compiling this file: 'src/mappings/samplemapping.ts'
   Suggestion: try to comment the whole file and uncomment it little by little while re-running the graph-cli until you isolate the line where the problem happens.
   Also, please contact us so we can make the CLI better by handling errors like this. You can reach out in any of these links:
   - Discord channel: https://discord.gg/eM8CA6WA9r
   - Github issues: https://github.com/graphprotocol/graph-cli/issues
   error Command failed with exit code 1.
   

5. simply commenting out the above import and replacing with the hardcoded string itself:

   import { Sample as SampleEvent } from "../../generated/SampleContractName/SampleContract";
   import { SampleEntity } from "../../generated/schema";
   // import { STR_HARDCODED } from "../../../src/constants"; // <-- no longer import from dir parent to subgraph
   
   export function handleSampleEvent(event: SampleEvent): void {
     const entity = new Entity(event.transaction.hash.toHex());
     entity.role = "StrVal"; // replaced with raw hardcoded string no longer imported
     entity.save();
   }
   

6. both codegen and build succeed

Let me know if any other info would help.

[azf20]

Hi! I don't know if wildcard exports are supported by Assemblyscript? https://github.com/AssemblyScript/assemblyscript/issues/27 cc @evaporei

[undermethod]

wildcard exports

Good call! Simply updating to the non-indexed path worked:

import { Sample as SampleEvent } from "../../generated/SampleContractName/SampleContract";
import { SampleEntity } from "../../generated/schema";
import { STR_HARDCODED } from "../../../src/constants/sampleconst"; // <-- added path to avoid wildcard

export function handleSampleEvent(event: SampleEvent): void {
  const entity = new Entity(event.transaction.hash.toHex());
  entity.role = STR_HARDCODED; // <-- now able to reference without error
  entity.save();
}

I've renamed the issue accordingly.

[PaulRBerg]

Wildcard exports are supported by the latest version of AssemblyScript, as well as the @graphprotocol packages.

So I think this issue should be closed now?

[PaulRBerg]

I noticed a strange behavior whereby files with nested export * from make the Graph Node to not be able to find the handler functions:

function handleCreateMerkleLL not found

But if I have only file that uses export * from, then it works.