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#JavaScript (ES6), 39 37 bytes
x=>"-~".repeat(x<0?-x:x).slice(x<0)+0
Saved 2 bytes thanks to @Neil
#JavaScript (ES6), 3939 37 bytes
x=>("x=>"-~".repeat(x<0?-x:x)+0).slice(x<0)+0
#JavaScript (ES6), 39 bytes
x=>("-~".repeat(x<0?-x:x)+0).slice(x<0)
