feat: support generating typings for specific contracts by patterns

.changeset/ten-dots-jump.md

@@ -0,0 +1,5 @@
+---
+'@typechain/hardhat': patch
+---
+
+It allows generating typings only for contracts that match the patterns.

packages/hardhat/src/config.ts

@@ -6,6 +6,7 @@ export function getDefaultTypechainConfig(config: HardhatConfig): TypechainConfi
   const defaultConfig: TypechainConfig = {
     outDir: 'typechain-types',
     target: 'ethers-v6',
+    artifacts: undefined,
     alwaysGenerateOverloads: false,
     discriminateTypes: false,
     tsNocheck: false,

packages/hardhat/src/index.ts

@@ -67,8 +67,12 @@ subtask(TASK_TYPECHAIN_GENERATE_TYPES)
     }
     const cwd = config.paths.root
 
+    const artifactPatterns = typechainCfg.artifacts ?? [
+      `${config.paths.artifacts}/!(build-info)/**/+([a-zA-Z0-9_]).json`,
+    ]
+
     const { glob } = await import('typechain')
-    const allFiles = glob(cwd, [`${config.paths.artifacts}/!(build-info)/**/+([a-zA-Z0-9_]).json`])
+    const allFiles = glob(cwd, artifactPatterns)
     if (typechainCfg.externalArtifacts) {
       allFiles.push(...glob(cwd, typechainCfg.externalArtifacts, false))
     }
@@ -90,7 +94,7 @@ subtask(TASK_TYPECHAIN_GENERATE_TYPES)
     const { runTypeChain } = await import('typechain')
     const result = await runTypeChain({
       ...typechainOptions,
-      filesToProcess: needsFullRebuild ? allFiles : glob(cwd, artifactPaths), // only process changed files if not doing full rebuild
+      filesToProcess: needsFullRebuild ? allFiles : allFiles.filter((x: string) => artifactPaths.includes(x)), // only process changed files if not doing full rebuild
     })
 
     if (!quiet) {

packages/hardhat/src/types.ts

@@ -1,6 +1,7 @@
 export interface TypechainConfig {
   outDir: string
   target: string
+  artifacts?: string[] | undefined
   alwaysGenerateOverloads: boolean
   discriminateTypes: boolean
   tsNocheck: boolean

packages/hardhat/test/project.test.ts

@@ -129,6 +129,86 @@ describe('Typechain x Hardhat', function () {
       expect(consoleLogMock).toHaveBeenCalledWith(['Successfully generated 14 typings for external artifacts!'])
     })
   })
+
+  describe('when setting custom artifact glob', () => {
+    let oldArtifactGlob: string[] | undefined
+    beforeEach(function () {
+      oldArtifactGlob = this.hre.config.typechain.artifacts
+    })
+    afterEach(function () {
+      this.hre.config.typechain.artifacts = oldArtifactGlob
+    })
+    ;[true, false].forEach((forcedCompilation) => {
+      describe(`when type generation is ${forcedCompilation ? '' : 'not'} forced`, () => {
+        let subject: () => Promise<void>
+        beforeEach(async function () {
+          if (forcedCompilation) {
+            await this.hre.run('compile', { noTypechain: true })
+          }
+          subject = () => {
+            if (forcedCompilation) {
+              return this.hre.run('typechain')
+            } else {
+              return this.hre.run('compile')
+            }
+          }
+        })
+
+        describe('when glob matches some files', () => {
+          beforeEach(function () {
+            this.hre.config.typechain.artifacts = ['**/EdgeCases.json']
+          })
+
+          it('includes build artifacts that match the glob', async function () {
+            const exists = existsSync(this.hre.config.typechain.outDir)
+            expect(exists).toEqual(false)
+
+            await subject()
+
+            const dir = await readdir(this.hre.config.typechain.outDir)
+            expect(dir.includes('EdgeCases.ts')).toEqual(true)
+          })
+
+          it('excludes build artifacts that do not match the glob', async function () {
+            const exists = existsSync(this.hre.config.typechain.outDir)
+            expect(exists).toEqual(false)
+
+            await subject()
+
+            const dir = await readdir(this.hre.config.typechain.outDir)
+            expect(dir.includes('TestContract.ts')).toEqual(false)
+            expect(dir.includes('TestContract1.ts')).toEqual(false)
+          })
+        })
+        describe('when glob matches no files', () => {
+          beforeEach(function () {
+            this.hre.config.typechain.artifacts = ['**/THISDOESNTMATCHANYTHING.json']
+          })
+
+          describe('when no external artifacts are specified', () => {
+            it('does not generate any types', async function () {
+              const exists = existsSync(this.hre.config.typechain.outDir)
+              expect(exists).toEqual(false)
+
+              await subject()
+              expect(existsSync(this.hre.config.typechain.outDir)).toEqual(false)
+            })
+          })
+
+          describe('when external artifacts are specified', () => {
+            it('only generates types for external artifacts', async function () {
+              const exists = existsSync(this.hre.config.typechain.outDir)
+              expect(exists).toEqual(false)
+
+              this.hre.config.typechain.externalArtifacts = ['externalArtifacts/*.json']
+              await subject()
+              expect(existsSync(this.hre.config.typechain.outDir)).toEqual(true)
+            })
+          })
+        })
+      })
+    })
+  })
 })
 
 describe('dontOverrideCompile', function () {