chore: Add custom inspect for base types

yarn-project/foundation/src/abi/selector.ts

@@ -1,3 +1,5 @@
+import { inspect } from 'util';
+
 import { toBufferBE } from '../bigint-buffer/index.js';
 import { Fr } from '../fields/index.js';
 
@@ -34,7 +36,11 @@ export abstract class Selector {
    * @returns The string.
    */
   toString(): string {
-    return this.toBuffer().toString('hex');
+    return '0x' + this.toBuffer().toString('hex');
+  }
+
+  [inspect.custom]() {
+    return `Selector<${this.toString()}>`;
   }
 
   /**

yarn-project/foundation/src/aztec-address/index.ts

@@ -1,3 +1,5 @@
+import { inspect } from 'util';
+
 import { Fr, fromBuffer } from '../fields/index.js';
 import { BufferReader, FieldReader } from '../serialize/index.js';
 
@@ -16,6 +18,10 @@ export class AztecAddress extends Fr {
     super(buffer);
   }
 
+  [inspect.custom]() {
+    return `AztecAddress<${this.toString()}>`;
+  }
+
   static ZERO = new AztecAddress(Buffer.alloc(32));
 
   static zero(): AztecAddress {

yarn-project/foundation/src/eth-address/index.ts

@@ -1,3 +1,5 @@
+import { inspect } from 'util';
+
 import { keccak256String } from '../crypto/keccak/index.js';
 import { randomBytes } from '../crypto/random/index.js';
 import { Fr } from '../fields/index.js';
@@ -158,6 +160,10 @@ export class EthAddress {
     return `0x${this.buffer.toString('hex')}` as `0x${string}`;
   }
 
+  [inspect.custom]() {
+    return `EthAddress<${this.toString()}>`;
+  }
+
   /**
    * Returns the Ethereum address as a checksummed string.
    * The output string will have characters in the correct upper or lowercase form, according to EIP-55.

yarn-project/foundation/src/fields/fields.ts

@@ -1,3 +1,5 @@
+import { inspect } from 'util';
+
 import { toBigIntBE, toBufferBE } from '../bigint-buffer/index.js';
 import { randomBytes } from '../crypto/random/index.js';
 import { BufferReader } from '../serialize/buffer_reader.js';
@@ -185,6 +187,10 @@ export class Fr extends BaseField {
     super(value);
   }
 
+  [inspect.custom]() {
+    return `Fr<${this.toString()}>`;
+  }
+
   protected modulus() {
     return Fr.MODULUS;
   }
@@ -251,6 +257,10 @@ export class Fq extends BaseField {
   private static HIGH_SHIFT = BigInt((BaseField.SIZE_IN_BYTES / 2) * 8);
   private static LOW_MASK = (1n << Fq.HIGH_SHIFT) - 1n;
 
+  [inspect.custom]() {
+    return `Fq<${this.toString()}>`;
+  }
+
   get low(): Fr {
     return new Fr(this.toBigInt() & Fq.LOW_MASK);
   }