diff --git a/src/internal/utils/artifact/generateAragonArtifact.ts b/src/internal/utils/artifact/generateAragonArtifact.ts
index cf02d2c..24229e6 100644
--- a/src/internal/utils/artifact/generateAragonArtifact.ts
+++ b/src/internal/utils/artifact/generateAragonArtifact.ts
@@ -29,7 +29,7 @@ export function generateAragonArtifact(
   flatCode: string
 ): AragonArtifact {
   const iface = new ethers.utils.Interface(abi)
-  
+
   const contractFunctions = parseContractFunctions(flatCode, contractName, {
     onlyTargetContract: true,
   })
@@ -40,7 +40,7 @@ export function generateAragonArtifact(
       roles: parsedFn.roles.map((role) => role.id),
       notice: parsedFn.notice,
       abi:
-        iface.getFunction(parsedFn.sig).format("json") ||
+        iface.getFunction(parsedFn.sig).format('json') ||
         (parsedFn.sig === 'fallback()' ? abiFallback : null),
       sig: parsedFn.sig,
     })),
diff --git a/src/internal/utils/ast/parseContractFunctions.ts b/src/internal/utils/ast/parseContractFunctions.ts
index a93af8d..4768b13 100644
--- a/src/internal/utils/ast/parseContractFunctions.ts
+++ b/src/internal/utils/ast/parseContractFunctions.ts
@@ -7,7 +7,7 @@ import {
   FunctionDefinition,
   ModifierInvocation,
   VariableDeclaration,
-} from '@solidity-parser/parser/dist/ast-types'
+} from '@solidity-parser/parser/src/ast-types'
 
 import { parseFunctionsNotices } from './parseFunctionNotices'
 import { AragonContractFunction } from './types'
@@ -69,7 +69,7 @@ function parseFunctionSignatureFromNode(node: FunctionDefinition): string {
      * Using an isolated function to use a switch / return structure
      */
     (nodeParam: VariableDeclaration): string => {
-      switch (nodeParam.typeName.type) {
+      switch (nodeParam.typeName?.type) {
         case 'ElementaryTypeName':
           return nodeParam.typeName.name
         case 'ArrayTypeName':
@@ -140,7 +140,7 @@ export function parseContractFunctions(
       ) {
         const returnParam = node.returnParameters[0]
         if (
-          returnParam.typeName.type === 'ArrayTypeName' &&
+          returnParam.typeName?.type === 'ArrayTypeName' &&
           returnParam.typeName.baseTypeName.type === 'ElementaryTypeName' &&
           returnParam.typeName.baseTypeName.name === 'uint256'
         )
@@ -162,34 +162,37 @@ export function parseContractFunctions(
   function parseContract(node: ContractDefinition): void {
     // Parse functions
     for (const subNode of node.subNodes) {
-      if (
-        subNode.type === 'FunctionDefinition' &&
-        // Ignore constructors
-        !subNode.isConstructor &&
-        // Only consider functions that modify state and are public / external
-        subNode.visibility !== 'internal' &&
-        subNode.visibility !== 'private' &&
-        subNode.stateMutability !== 'view' &&
-        subNode.stateMutability !== 'pure' &&
-        subNode.stateMutability !== 'constant'
-      ) {
-        // Check the modifiers
-        functions.push({
-          name: subNode.name || '',
-          notice: '',
-          // Parse parameters for signature, some functions may be overloaded
-          sig: parseFunctionSignatureFromNode(subNode),
-          // Parse the auth modifiers
-          roles: subNode.modifiers
-            .filter((modNode) => ['auth', 'authP'].includes(modNode.name))
-            .map((authModNode) => ({
-              id: parseRoleIdFromNode(authModNode),
-              paramCount: parseRoleParamCountFromNode(
-                authModNode,
-                authHelperFunctions
-              ),
-            })),
-        })
+      if (subNode.type === 'FunctionDefinition') {
+        const functionNode = subNode as FunctionDefinition
+
+        if (
+          // Ignore constructors
+          !functionNode.isConstructor &&
+          // Only consider functions that modify state and are public / external
+          functionNode.visibility !== 'internal' &&
+          functionNode.visibility !== 'private' &&
+          functionNode.stateMutability !== 'view' &&
+          functionNode.stateMutability !== 'pure' &&
+          functionNode.stateMutability !== 'constant'
+        ) {
+          // Check the modifiers
+          functions.push({
+            name: functionNode.name || '',
+            notice: '',
+            // Parse parameters for signature, some functions may be overloaded
+            sig: parseFunctionSignatureFromNode(functionNode),
+            // Parse the auth modifiers
+            roles: functionNode.modifiers
+              .filter((modNode) => ['auth', 'authP'].includes(modNode.name))
+              .map((authModNode) => ({
+                id: parseRoleIdFromNode(authModNode),
+                paramCount: parseRoleParamCountFromNode(
+                  authModNode,
+                  authHelperFunctions
+                ),
+              })),
+          })
+        }
       }
     }
 
diff --git a/src/internal/utils/ast/parseContructor.ts b/src/internal/utils/ast/parseContructor.ts
index ef66e72..a4b64a4 100644
--- a/src/internal/utils/ast/parseContructor.ts
+++ b/src/internal/utils/ast/parseContructor.ts
@@ -1,5 +1,5 @@
 import { parse, visit } from '@solidity-parser/parser'
-import { FunctionDefinition } from '@solidity-parser/parser/dist/ast-types'
+import { FunctionDefinition } from '@solidity-parser/parser/src/ast-types'
 
 /**
  * Returns true if a contract has a constructor, otherwise false.
diff --git a/src/internal/utils/ast/parseGlobalVariableAssignments.ts b/src/internal/utils/ast/parseGlobalVariableAssignments.ts
index fa0198c..2483529 100644
--- a/src/internal/utils/ast/parseGlobalVariableAssignments.ts
+++ b/src/internal/utils/ast/parseGlobalVariableAssignments.ts
@@ -1,5 +1,5 @@
 import { parse, visit } from '@solidity-parser/parser'
-import { StateVariableDeclaration } from '@solidity-parser/parser/dist/ast-types'
+import { StateVariableDeclaration } from '@solidity-parser/parser/src/ast-types'
 
 /**
  * Finds global storage variable declarations with initialized values, e.g 'int a = 1'.
@@ -17,7 +17,8 @@ export function parseGlobalVariableAssignments(sourceCode: string): string[] {
         !variable.isDeclaredConst &&
         variable.expression
       ) {
-        variables.push(variable.name)
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        variables.push(variable.name!)
       }
     },
   })
diff --git a/src/types/index.ts b/src/types/index.ts
index d1b0ced..19d2ee9 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -89,7 +89,10 @@ export interface AragonArtifactFunction {
    * The function's ABI element is included for convenience of the client
    * null if ABI is not found for this signature
    */
-  abi: utils.Fragment | null
+  abi:
+    | string
+    | { payable: boolean; stateMutability: string; type: string }
+    | null
 }
 
 export interface RoleWithBytes extends Role {