fix(language-core): avoid unchecked index access when parsing defineEmits

[KazariEX]

fix #5027

[pkg-pr-new]

Open in Stackblitz

vue-component-meta

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-meta@5028

vue-component-type-helpers

npm i https://pkg.pr.new/vuejs/language-tools/vue-component-type-helpers@5028

@vue/language-plugin-pug

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-plugin-pug@5028

@vue/language-core

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-core@5028

@vue/language-server

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-server@5028

@vue/language-service

npm i https://pkg.pr.new/vuejs/language-tools/@vue/language-service@5028

vue-tsc

npm i https://pkg.pr.new/vuejs/language-tools/vue-tsc@5028

@vue/typescript-plugin

npm i https://pkg.pr.new/vuejs/language-tools/@vue/typescript-plugin@5028

commit: 52baa61