ESLint Expects Expressions at Random Places in Code - vue.js

Question

ESLint is yelling at me for this Prop definition in a Vue single-file component written in Typescript:
#Prop({
default: () => ""
}) Query!: string
Module Warning (from ./node_modules/eslint-loader/index.js):
error: Parsing error: Expression expected at ›here‹ 2:4:
#Prop({
default: () => ""
^
}) Query!: string
It also complains here:
get RemainingTime() {
if(!this.myData.objectProperty) return null
return some_data
}
Module Warning (from ./node_modules/eslint-loader/index.js):
error: Parsing error: Expression expected at src/views/list/ProjectBox.vue:79:8:
get RemainingTime() {
if(!this.myData.objectProperty) return null
^
In my eslint.rc:
parserOptions: {
parser: '#typescript-eslint/parser',
}
What expression is expected here -- or what else causes the linter error?
I’m happy to provide further information, but since I’m unfamiliar with the technology stack I don’t know what to include—and I don’t want to dump each configuration file here. The project was setup using vue-cli.