feat: add "strictNullChecks"

src/WABinary/Legacy/constants.ts

@@ -201,5 +201,5 @@ export const SINGLE_BYTE_TOKENS = [
 export const TOKEN_MAP: { [token: string]: { dict?: number, index: number } } = { }
 
 for(let i = 0;i < SINGLE_BYTE_TOKENS.length;i++) {
-	TOKEN_MAP[SINGLE_BYTE_TOKENS[i]] = { index: i }
+	TOKEN_MAP[SINGLE_BYTE_TOKENS[i]!] = { index: i }
 }

src/WABinary/decode.ts

@@ -153,7 +153,7 @@ export const decodeDecompressedBinaryNode = (
 
 	const readString = (tag: number): string => {
 		if(tag >= 1 && tag < SINGLE_BYTE_TOKENS.length) {
-			return SINGLE_BYTE_TOKENS[tag]
+			return SINGLE_BYTE_TOKENS[tag] || ''
 		}
 
 		switch (tag) {
@@ -163,7 +163,7 @@ export const decodeDecompressedBinaryNode = (
 		case TAGS.DICTIONARY_3:
 			return getTokenDouble(tag - TAGS.DICTIONARY_0, readByte())
 		case TAGS.LIST_EMPTY:
-			return null
+			return ''
 		case TAGS.BINARY_8:
 			return readStringFromChars(readByte())
 		case TAGS.BINARY_20:

src/WABinary/encode.ts

@@ -1,6 +1,6 @@
 
 import * as constants from './constants'
-import { jidDecode } from './jid-utils'
+import { FullJid, jidDecode } from './jid-utils'
 import type { BinaryNode, BinaryNodeCodingOptions } from './types'
 
 export const encodeBinaryNode = (
@@ -52,7 +52,7 @@ export const encodeBinaryNode = (
 		pushBytes(bytes)
 	}
 
-	const writeJid = ({ agent, device, user, server }: ReturnType<typeof jidDecode>) => {
+	const writeJid = ({ agent, device, user, server }: FullJid) => {
 		if(typeof agent !== 'undefined' || typeof device !== 'undefined') {
 			pushByte(TAGS.AD_JID)
 			pushByte(agent || 0)

src/WABinary/generic-utils.ts

@@ -4,9 +4,9 @@ import { BinaryNode } from './types'
 
 // some extra useful utilities
 
-export const getBinaryNodeChildren = ({ content }: BinaryNode, childTag: string) => {
-	if(Array.isArray(content)) {
-		return content.filter(item => item.tag === childTag)
+export const getBinaryNodeChildren = (node: BinaryNode | undefined, childTag: string) => {
+	if(Array.isArray(node?.content)) {
+		return node!.content.filter(item => item.tag === childTag)
 	}
 
 	return []
@@ -20,20 +20,20 @@ export const getAllBinaryNodeChildren = ({ content }: BinaryNode) => {
 	return []
 }
 
-export const getBinaryNodeChild = ({ content }: BinaryNode, childTag: string) => {
-	if(Array.isArray(content)) {
-		return content.find(item => item.tag === childTag)
+export const getBinaryNodeChild = (node: BinaryNode | undefined, childTag: string) => {
+	if(Array.isArray(node?.content)) {
+		return node?.content.find(item => item.tag === childTag)
 	}
 }
 
-export const getBinaryNodeChildBuffer = (node: BinaryNode, childTag: string) => {
+export const getBinaryNodeChildBuffer = (node: BinaryNode | undefined, childTag: string) => {
 	const child = getBinaryNodeChild(node, childTag)?.content
 	if(Buffer.isBuffer(child) || child instanceof Uint8Array) {
 		return child
 	}
 }
 
-export const getBinaryNodeChildString = (node: BinaryNode, childTag: string) => {
+export const getBinaryNodeChildString = (node: BinaryNode | undefined, childTag: string) => {
 	const child = getBinaryNodeChild(node, childTag)?.content
 	if(Buffer.isBuffer(child) || child instanceof Uint8Array) {
 		return Buffer.from(child).toString('utf-8')

src/WABinary/jid-utils.ts

@@ -11,18 +11,23 @@ export type JidWithDevice = {
     device?: number
 }
 
+export type FullJid = JidWithDevice & {
+	server: JidServer | string
+	agent?: number
+}
+
 export const jidEncode = (user: string | number | null, server: JidServer, device?: number, agent?: number) => {
 	return `${user || ''}${!!agent ? `_${agent}` : ''}${!!device ? `:${device}` : ''}@${server}`
 }
 
-export const jidDecode = (jid: string) => {
+export const jidDecode = (jid: string | undefined): FullJid | undefined => {
 	const sepIdx = typeof jid === 'string' ? jid.indexOf('@') : -1
 	if(sepIdx < 0) {
 		return undefined
 	}
 
-	const server = jid.slice(sepIdx + 1)
-	const userCombined = jid.slice(0, sepIdx)
+	const server = jid!.slice(sepIdx + 1)
+	const userCombined = jid!.slice(0, sepIdx)
 
 	const [userAgent, device] = userCombined.split(':')
 	const [user, agent] = userAgent.split('_')
@@ -36,7 +41,7 @@ export const jidDecode = (jid: string) => {
 }
 
 /** is the jid a user */
-export const areJidsSameUser = (jid1: string, jid2: string) => (
+export const areJidsSameUser = (jid1: string | undefined, jid2: string | undefined) => (
 	jidDecode(jid1)?.user === jidDecode(jid2)?.user
 )
 /** is the jid a user */
@@ -49,6 +54,6 @@ export const isJidGroup = (jid: string) => (jid?.endsWith('@g.us'))
 export const isJidStatusBroadcast = (jid: string) => jid === 'status@broadcast'
 
 export const jidNormalizedUser = (jid: string) => {
-	const { user, server } = jidDecode(jid)
+	const { user, server } = jidDecode(jid)!
 	return jidEncode(user, server === 'c.us' ? 's.whatsapp.net' : server as JidServer)
 }