diff --git a/packages/ripple-address-codec/.eslintrc.js b/packages/ripple-address-codec/.eslintrc.js
index 81d98811..715a66b0 100644
--- a/packages/ripple-address-codec/.eslintrc.js
+++ b/packages/ripple-address-codec/.eslintrc.js
@@ -5,7 +5,7 @@ module.exports = {
   parserOptions: {
     // Enable linting rules with type information from our tsconfig
     tsconfigRootDir: __dirname,
-    project: ['./tsconfig.json'],
+    project: ['./tsconfig.eslint.json'],
 
     sourceType: 'module', // Allow the use of imports / ES modules
 
diff --git a/packages/ripple-address-codec/jest.config.js b/packages/ripple-address-codec/jest.config.js
index 70d1971d..5a02b5b5 100644
--- a/packages/ripple-address-codec/jest.config.js
+++ b/packages/ripple-address-codec/jest.config.js
@@ -3,5 +3,6 @@ const base = require('../../jest.config.base.js')
 
 module.exports = {
   ...base,
+  roots: [...base.roots, '<rootDir>/test'],
   displayName: 'ripple-address-codec',
 }
diff --git a/packages/ripple-address-codec/package.json b/packages/ripple-address-codec/package.json
index cc65865d..1876a991 100644
--- a/packages/ripple-address-codec/package.json
+++ b/packages/ripple-address-codec/package.json
@@ -26,10 +26,10 @@
   "prepublish": "tsc -b",
   "prepublishOnly": "tslint -b ./ && jest",
   "scripts": {
-    "build": "tsc -b",
-    "test": "jest --verbose false --silent=false ./src/*.test.js",
+    "build": "tsc --build tsconfig.build.json",
+    "test": "jest --verbose false --silent=false ./test/*.test.ts",
     "lint": "eslint . --ext .ts",
-    "clean": "rm -rf ./dist && rm -rf tsconfig.tsbuildinfo"
+    "clean": "rm -rf ./dist && rm -rf ./coverage && rm -rf tsconfig.tsbuildinfo"
   },
   "prettier": "@xrplf/prettier-config",
   "engines": {
diff --git a/packages/ripple-address-codec/src/index.test.js b/packages/ripple-address-codec/test/index.test.ts
similarity index 92%
rename from packages/ripple-address-codec/src/index.test.js
rename to packages/ripple-address-codec/test/index.test.ts
index a26c5762..57d5c506 100644
--- a/packages/ripple-address-codec/src/index.test.js
+++ b/packages/ripple-address-codec/test/index.test.ts
@@ -1,11 +1,22 @@
-const {
+import {
   classicAddressToXAddress,
   xAddressToClassicAddress,
   isValidXAddress,
   encodeXAddress,
-} = require('./index')
+} from '../src'
 
-const testCases = [
+interface AddressTestCase {
+  // classicAddress
+  [0]: string
+  // tag
+  [1]: false | number
+  // mainnetAddress
+  [2]: string
+  // testnetAddress
+  [3]: string
+}
+
+const testCases: AddressTestCase[] = [
   [
     'r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59',
     false,
@@ -144,10 +155,9 @@ const testCases = [
   const MAX_32_BIT_UNSIGNED_INT = 4294967295
   const network = isTestAddress ? ' (test)' : ' (main)'
 
-  for (const i in testCases) {
-    const testCase = testCases[i]
+  testCases.forEach((testCase) => {
     const classicAddress = testCase[0]
-    const tag = testCase[1] !== false ? testCase[1] : false
+    const tag = testCase[1] === false ? false : testCase[1]
     const xAddress = isTestAddress ? testCase[3] : testCase[2]
     test(`Converts ${classicAddress}${
       tag ? `:${tag}` : ''
@@ -163,7 +173,7 @@ const testCases = [
       })
       expect(isValidXAddress(xAddress)).toBe(true)
     })
-  }
+  })
 
   {
     const classicAddress = 'rGWrZyQqhTp9Xu7G5Pkayo7bXjH4k4QYpf'
@@ -196,9 +206,14 @@ const testCases = [
     ]
 
     highAndLowAccounts.forEach((accountId) => {
-      const testCases = [false, 0, 1, MAX_32_BIT_UNSIGNED_INT]
-      testCases.forEach((t) => {
-        const tag = t | false
+      const tagTestCases: Array<false | number> = [
+        false,
+        0,
+        1,
+        MAX_32_BIT_UNSIGNED_INT,
+      ]
+      tagTestCases.forEach((testCase) => {
+        const tag = testCase || false
         const xAddress = encodeXAddress(accountId, tag, isTestAddress)
         test(`Encoding ${accountId.toString('hex')}${
           tag ? `:${tag}` : ''
@@ -253,6 +268,7 @@ test(`isValidXAddress returns false for invalid X-address`, () => {
 
 test(`Converts X7AcgcsBL6XDcUb... to r9cZA1mLK5R5A... and tag: false`, () => {
   const classicAddress = 'r9cZA1mLK5R5Am25ArfXFmqgNwjZgnfk59'
+  // eslint-disable-next-line @typescript-eslint/naming-convention -- tag can be false or a number
   const tag = false
   const xAddress = 'X7AcgcsBL6XDcUb289X4mJ8djcdyKaB5hJDWMArnXr61cqZ'
   const isTestAddress = false
diff --git a/packages/ripple-address-codec/src/utils.test.js b/packages/ripple-address-codec/test/utils.test.ts
similarity index 86%
rename from packages/ripple-address-codec/src/utils.test.js
rename to packages/ripple-address-codec/test/utils.test.ts
index f14e9084..dfac224f 100644
--- a/packages/ripple-address-codec/src/utils.test.js
+++ b/packages/ripple-address-codec/test/utils.test.ts
@@ -1,4 +1,4 @@
-const {seqEqual, concatArgs} = require('./utils')
+import { seqEqual, concatArgs } from '../src/utils'
 
 test('two sequences are equal', () => {
   expect(seqEqual([1, 2, 3], [1, 2, 3])).toBe(true)
@@ -28,7 +28,9 @@ test('plain numbers are concatenated', () => {
 })
 
 test('a variety of values are concatenated', () => {
-  expect(concatArgs(1, [2, 3], Buffer.from([4,5]), new Uint8Array([6, 7]))).toStrictEqual([1,2,3,4,5,6,7])
+  expect(
+    concatArgs(1, [2, 3], Buffer.from([4, 5]), new Uint8Array([6, 7])),
+  ).toStrictEqual([1, 2, 3, 4, 5, 6, 7])
 })
 
 test('a single value is returned as an array', () => {
diff --git a/packages/ripple-address-codec/src/xrp-codec.test.js b/packages/ripple-address-codec/test/xrp-codec.test.ts
similarity index 74%
rename from packages/ripple-address-codec/src/xrp-codec.test.js
rename to packages/ripple-address-codec/test/xrp-codec.test.ts
index e1211c3f..c70123e7 100644
--- a/packages/ripple-address-codec/src/xrp-codec.test.js
+++ b/packages/ripple-address-codec/test/xrp-codec.test.ts
@@ -1,22 +1,39 @@
-const api = require('./xrp-codec')
+import {
+  codec,
+  decodeAccountID,
+  decodeAccountPublic,
+  decodeNodePublic,
+  decodeSeed,
+  encodeAccountID,
+  encodeAccountPublic,
+  encodeNodePublic,
+  encodeSeed,
+  isValidClassicAddress,
+} from '../src'
 
-function toHex(bytes) {
+function toHex(bytes: Buffer): string {
   return Buffer.from(bytes).toString('hex').toUpperCase()
 }
 
-function toBytes(hex) {
+function toBytes(hex: string): Buffer {
   return Buffer.from(hex, 'hex')
 }
 
 /**
  * Create a test case for encoding data and a test case for decoding data.
  *
- * @param encoder Encoder function to test
- * @param decoder Decoder function to test
- * @param base58 Base58-encoded string to decode
- * @param hex Hexadecimal representation of expected decoded data
+ * @param encoder - Encoder function to test
+ * @param decoder - Decoder function to test
+ * @param base58 - Base58-encoded string to decode
+ * @param hex - Hexadecimal representation of expected decoded data
  */
-function makeEncodeDecodeTest(encoder, decoder, base58, hex) {
+// eslint-disable-next-line max-params -- needs them
+function makeEncodeDecodeTest(
+  encoder: (val: Buffer) => string,
+  decoder: (val: string) => Buffer,
+  base58: string,
+  hex: string,
+): void {
   test(`can translate between ${hex} and ${base58}`, function () {
     const actual = encoder(toBytes(hex))
     expect(actual).toBe(base58)
@@ -28,70 +45,66 @@ function makeEncodeDecodeTest(encoder, decoder, base58, hex) {
 }
 
 makeEncodeDecodeTest(
-  api.encodeAccountID,
-  api.decodeAccountID,
+  encodeAccountID,
+  decodeAccountID,
   'rJrRMgiRgrU6hDF4pgu5DXQdWyPbY35ErN',
   'BA8E78626EE42C41B46D46C3048DF3A1C3C87072',
 )
 
 makeEncodeDecodeTest(
-  api.encodeNodePublic,
-  api.decodeNodePublic,
+  encodeNodePublic,
+  decodeNodePublic,
   'n9MXXueo837zYH36DvMc13BwHcqtfAWNJY5czWVbp7uYTj7x17TH',
   '0388E5BA87A000CB807240DF8C848EB0B5FFA5C8E5A521BC8E105C0F0A44217828',
 )
 
 makeEncodeDecodeTest(
-  api.encodeAccountPublic,
-  api.decodeAccountPublic,
+  encodeAccountPublic,
+  decodeAccountPublic,
   'aB44YfzW24VDEJQ2UuLPV2PvqcPCSoLnL7y5M1EzhdW4LnK5xMS3',
   '023693F15967AE357D0327974AD46FE3C127113B1110D6044FD41E723689F81CC6',
 )
 
 test('can decode arbitrary seeds', function () {
-  const decoded = api.decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
+  const decoded = decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
   expect(toHex(decoded.bytes)).toBe('4C3A1D213FBDFB14C7C28D609469B341')
   expect(decoded.type).toBe('ed25519')
 
-  const decoded2 = api.decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
+  const decoded2 = decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
   expect(toHex(decoded2.bytes)).toBe('CF2DE378FBDD7E2EE87D486DFB5A7BFF')
   expect(decoded2.type).toBe('secp256k1')
 })
 
 test('can pass a type as second arg to encodeSeed', function () {
   const edSeed = 'sEdTM1uX8pu2do5XvTnutH6HsouMaM2'
-  const decoded = api.decodeSeed(edSeed)
+  const decoded = decodeSeed(edSeed)
   const type = 'ed25519'
   expect(toHex(decoded.bytes)).toBe('4C3A1D213FBDFB14C7C28D609469B341')
   expect(decoded.type).toBe(type)
-  expect(api.encodeSeed(decoded.bytes, type)).toBe(edSeed)
+  expect(encodeSeed(decoded.bytes, type)).toBe(edSeed)
 })
 
 test('isValidClassicAddress - secp256k1 address valid', function () {
-  expect(api.isValidClassicAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw1')).toBe(
-    true,
-  )
+  expect(isValidClassicAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw1')).toBe(true)
 })
 
 test('isValidClassicAddress - ed25519 address valid', function () {
-  expect(api.isValidClassicAddress('rLUEXYuLiQptky37CqLcm9USQpPiz5rkpD')).toBe(
-    true,
-  )
+  expect(isValidClassicAddress('rLUEXYuLiQptky37CqLcm9USQpPiz5rkpD')).toBe(true)
 })
 
 test('isValidClassicAddress - invalid', function () {
-  expect(api.isValidClassicAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw2')).toBe(
+  expect(isValidClassicAddress('rU6K7V3Po4snVhBBaU29sesqs2qTQJWDw2')).toBe(
     false,
   )
 })
 
 test('isValidClassicAddress - empty', function () {
-  expect(api.isValidClassicAddress('')).toBe(false)
+  expect(isValidClassicAddress('')).toBe(false)
 })
 
 describe('encodeSeed', function () {
   it('encodes a secp256k1 seed', function () {
-    const result = api.encodeSeed(
+    const result = encodeSeed(
       Buffer.from('CF2DE378FBDD7E2EE87D486DFB5A7BFF', 'hex'),
       'secp256k1',
     )
@@ -99,7 +112,7 @@ describe('encodeSeed', function () {
   })
 
   it('encodes low secp256k1 seed', function () {
-    const result = api.encodeSeed(
+    const result = encodeSeed(
       Buffer.from('00000000000000000000000000000000', 'hex'),
       'secp256k1',
     )
@@ -107,7 +120,7 @@ describe('encodeSeed', function () {
   })
 
   it('encodes high secp256k1 seed', function () {
-    const result = api.encodeSeed(
+    const result = encodeSeed(
       Buffer.from('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF', 'hex'),
       'secp256k1',
     )
@@ -115,7 +128,7 @@ describe('encodeSeed', function () {
   })
 
   it('encodes an ed25519 seed', function () {
-    const result = api.encodeSeed(
+    const result = encodeSeed(
       Buffer.from('4C3A1D213FBDFB14C7C28D609469B341', 'hex'),
       'ed25519',
     )
@@ -123,7 +136,7 @@ describe('encodeSeed', function () {
   })
 
   it('encodes low ed25519 seed', function () {
-    const result = api.encodeSeed(
+    const result = encodeSeed(
       Buffer.from('00000000000000000000000000000000', 'hex'),
       'ed25519',
     )
@@ -131,7 +144,7 @@ describe('encodeSeed', function () {
   })
 
   it('encodes high ed25519 seed', function () {
-    const result = api.encodeSeed(
+    const result = encodeSeed(
       Buffer.from('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF', 'hex'),
       'ed25519',
     )
@@ -140,7 +153,7 @@ describe('encodeSeed', function () {
 
   test('attempting to encode a seed with less than 16 bytes of entropy throws', function () {
     expect(() => {
-      api.encodeSeed(
+      encodeSeed(
         Buffer.from('CF2DE378FBDD7E2EE87D486DFB5A7B', 'hex'),
         'secp256k1',
       )
@@ -149,7 +162,7 @@ describe('encodeSeed', function () {
 
   test('attempting to encode a seed with more than 16 bytes of entropy throws', function () {
     expect(() => {
-      api.encodeSeed(
+      encodeSeed(
         Buffer.from('CF2DE378FBDD7E2EE87D486DFB5A7BFFFF', 'hex'),
         'secp256k1',
       )
@@ -159,13 +172,13 @@ describe('encodeSeed', function () {
 
 describe('decodeSeed', function () {
   it('can decode an Ed25519 seed', function () {
-    const decoded = api.decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
+    const decoded = decodeSeed('sEdTM1uX8pu2do5XvTnutH6HsouMaM2')
     expect(toHex(decoded.bytes)).toBe('4C3A1D213FBDFB14C7C28D609469B341')
     expect(decoded.type).toBe('ed25519')
   })
 
   it('can decode a secp256k1 seed', function () {
-    const decoded = api.decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
+    const decoded = decodeSeed('sn259rEFXrQrWyx3Q7XneWcwV6dfL')
     expect(toHex(decoded.bytes)).toBe('CF2DE378FBDD7E2EE87D486DFB5A7BFF')
     expect(decoded.type).toBe('secp256k1')
   })
@@ -173,7 +186,7 @@ describe('decodeSeed', function () {
 
 describe('encodeAccountID', function () {
   it('can encode an AccountID', function () {
-    const encoded = api.encodeAccountID(
+    const encoded = encodeAccountID(
       Buffer.from('BA8E78626EE42C41B46D46C3048DF3A1C3C87072', 'hex'),
     )
     expect(encoded).toBe('rJrRMgiRgrU6hDF4pgu5DXQdWyPbY35ErN')
@@ -181,7 +194,7 @@ describe('encodeAccountID', function () {
 
   test('unexpected length should throw', function () {
     expect(() => {
-      api.encodeAccountID(Buffer.from('ABCDEF', 'hex'))
+      encodeAccountID(Buffer.from('ABCDEF', 'hex'))
     }).toThrow(
       'unexpected_payload_length: bytes.length does not match expectedLength',
     )
@@ -190,7 +203,7 @@ describe('encodeAccountID', function () {
 
 describe('decodeNodePublic', function () {
   it('can decode a NodePublic', function () {
-    const decoded = api.decodeNodePublic(
+    const decoded = decodeNodePublic(
       'n9MXXueo837zYH36DvMc13BwHcqtfAWNJY5czWVbp7uYTj7x17TH',
     )
     expect(toHex(decoded)).toBe(
@@ -201,7 +214,7 @@ describe('decodeNodePublic', function () {
 
 test('encodes 123456789 with version byte of 0', () => {
   expect(
-    api.codec.encode(Buffer.from('123456789'), {
+    codec.encode(Buffer.from('123456789'), {
       versions: [0],
       expectedLength: 9,
     }),
@@ -210,7 +223,7 @@ test('encodes 123456789 with version byte of 0', () => {
 
 test('multiple versions with no expected length should throw', () => {
   expect(() => {
-    api.codec.decode('rnaC7gW34M77Kneb78s', {
+    codec.decode('rnaC7gW34M77Kneb78s', {
       versions: [0, 1],
     })
   }).toThrow(
@@ -220,7 +233,7 @@ test('multiple versions with no expected length should throw', () => {
 
 test('attempting to decode data with length < 5 should throw', () => {
   expect(() => {
-    api.codec.decode('1234', {
+    codec.decode('1234', {
       versions: [0],
     })
   }).toThrow('invalid_input_size: decoded data must have length >= 5')
@@ -228,7 +241,7 @@ test('attempting to decode data with length < 5 should throw', () => {
 
 test('attempting to decode data with unexpected version should throw', () => {
   expect(() => {
-    api.codec.decode('rnaC7gW34M77Kneb78s', {
+    codec.decode('rnaC7gW34M77Kneb78s', {
       versions: [2],
     })
   }).toThrow(
@@ -238,7 +251,7 @@ test('attempting to decode data with unexpected version should throw', () => {
 
 test('invalid checksum should throw', () => {
   expect(() => {
-    api.codec.decode('123456789', {
+    codec.decode('123456789', {
       versions: [0, 1],
     })
   }).toThrow('checksum_invalid')
@@ -246,7 +259,7 @@ test('invalid checksum should throw', () => {
 
 test('empty payload should throw', () => {
   expect(() => {
-    api.codec.decode('', {
+    codec.decode('', {
       versions: [0, 1],
     })
   }).toThrow('invalid_input_size: decoded data must have length >= 5')
@@ -254,7 +267,7 @@ test('empty payload should throw', () => {
 
 test('decode data', () => {
   expect(
-    api.codec.decode('rnaC7gW34M77Kneb78s', {
+    codec.decode('rnaC7gW34M77Kneb78s', {
       versions: [0],
     }),
   ).toStrictEqual({
@@ -266,7 +279,7 @@ test('decode data', () => {
 
 test('decode data with expected length', function () {
   expect(
-    api.codec.decode('rnaC7gW34M77Kneb78s', {
+    codec.decode('rnaC7gW34M77Kneb78s', {
       versions: [0],
       expectedLength: 9,
     }),
@@ -279,7 +292,7 @@ test('decode data with expected length', function () {
 
 test('decode data with wrong expected length should throw', function () {
   expect(() => {
-    api.codec.decode('rnaC7gW34M77Kneb78s', {
+    codec.decode('rnaC7gW34M77Kneb78s', {
       versions: [0],
       expectedLength: 8,
     })
@@ -287,7 +300,7 @@ test('decode data with wrong expected length should throw', function () {
     'version_invalid: version bytes do not match any of the provided version(s)',
   )
   expect(() => {
-    api.codec.decode('rnaC7gW34M77Kneb78s', {
+    codec.decode('rnaC7gW34M77Kneb78s', {
       versions: [0],
       expectedLength: 10,
     })
diff --git a/packages/ripple-address-codec/tsconfig.build.json b/packages/ripple-address-codec/tsconfig.build.json
new file mode 100644
index 00000000..7f59b80d
--- /dev/null
+++ b/packages/ripple-address-codec/tsconfig.build.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "rootDir": "./src",
+  },
+  "include": ["./src/**/*.ts", "./src/**/*.json"]
+}
diff --git a/packages/ripple-address-codec/tsconfig.eslint.json b/packages/ripple-address-codec/tsconfig.eslint.json
index 0b4edec6..16dc56bd 100644
--- a/packages/ripple-address-codec/tsconfig.eslint.json
+++ b/packages/ripple-address-codec/tsconfig.eslint.json
@@ -1,4 +1,4 @@
 {
   "extends": "./tsconfig.json",
-  "include": ["src/**/*.ts", "src/*.test.ts"]
+  "include": ["src/**/*.ts", "test/*.test.ts"]
 }
diff --git a/packages/ripple-address-codec/tsconfig.json b/packages/ripple-address-codec/tsconfig.json
index 941f61aa..520f2f7a 100644
--- a/packages/ripple-address-codec/tsconfig.json
+++ b/packages/ripple-address-codec/tsconfig.json
@@ -5,7 +5,6 @@
     "lib": [
       "es2017"
     ],
-    "rootDir": "./src",
     "outDir": "./dist",
     "noUnusedLocals": true,
     "noUnusedParameters": true,